Advertise on Bikeforums.net



User Tag List

Page 54 of 75 FirstFirst ... 444525354555664 ... LastLast
Results 1,326 to 1,350 of 1865

Thread: Total Geekiness

  1. #1326
    52-week commuter DCCommuter's Avatar
    Join Date
    Mar 2005
    Location
    Washington, DC
    My Bikes
    Redline Conquest, Cannonday, Specialized, RANS
    Posts
    1,929
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by diff_lock2
    I found a 12v MR16 20 led light, 1.8w... for i think 9-12$...
    I was thinking tail light, just gota figur how to get it red...
    Buy one with red LED's. It's much more efficient. Red LED's only produce red light, so all of the energy goes to producing light. If you put a red lens in front of a white light, it filters out everything but the red portion of the white light. All of the energy used to produce the non-red portion is wasted. This is particularly problematic with white LED's, which produce relatively little red light -- their light is noticeably bluer and whiter than incandescant.

    Here's a link to a red LED MR16 for less than $8: http://store.peclamp.com/led001.html
    The United States of America is the only democratic nation in the world to deny citizens living in the nation's capital representation in the national legislature. District residents have no vote in either the U.S. Senate or U.S. House of Representatives. www.dcvote.org

  2. #1327
    Senior Member NeezyDeezy's Avatar
    Join Date
    Jun 2006
    Posts
    880
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Map tester
    I just got a MR16 12 Volt Super High Powered 3 Watt Luxeon LED ($15.99) from Autolumination.com. I just gave it a quick test last night and it was impressive. The center spot is not quite as bright as my 20 watt halogen, but the light-bleed to the side is brighter and more even. I think this might do the job for a in-town headlight. I'll try to get it installed tonight and get a report this weekend--our forecast for tomorrow is for ~2 inches of rain.
    Do you by any chance know if either of the autoumination MR16 3W Luxeon LED bulbs (normal and wide angle) will fit into the Optronics driving headlights housing (like, QH-8CC or something)?

  3. #1328
    52-week commuter DCCommuter's Avatar
    Join Date
    Mar 2005
    Location
    Washington, DC
    My Bikes
    Redline Conquest, Cannonday, Specialized, RANS
    Posts
    1,929
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Map tester
    I just got a MR16 12 Volt Super High Powered 3 Watt Luxeon LED ($15.99) from Autolumination.com. I just gave it a quick test last night and it was impressive. The center spot is not quite as bright as my 20 watt halogen, but the light-bleed to the side is brighter and more even. I think this might do the job for a in-town headlight. I'll try to get it installed tonight and get a report this weekend--our forecast for tomorrow is for ~2 inches of rain.
    I recently bought a 21-led MR-16 bulb on Ebay for 8.49 including shipping, and I have to agree with your general assessment. It's a very good "to-be-seen" light, visible and prominent from quite a distance, but it doesn't do much to illuminate the path in front of me. As a test this week, I've replaced my old setup of dual 10w halogens with one 20w halogen and the LED. I figure it's about the same power consumption and a lot more light.

    It does suffer from the same misleading advertising that haunts almost all LED bulbs.
    Light output: 38 Lumens (about 10 to 15 watt of a halogen)
    A 10 watt halogen produces somewhere between 120 and 400 lumens, depending on the manufacturer. So it's not even close. Interestingly, the lumens per watt are about the same with the LED and the halogen; the quality of the light differs.

    My feeling is that using halogen and LED's together gives the best of both worlds.
    The United States of America is the only democratic nation in the world to deny citizens living in the nation's capital representation in the national legislature. District residents have no vote in either the U.S. Senate or U.S. House of Representatives. www.dcvote.org

  4. #1329
    Senior Member balto charlie's Avatar
    Join Date
    Aug 2004
    Location
    Baltimore/DC
    Posts
    2,442
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Hey folks: This is the best thread on BF.net My Question for the masses:
    What happens to an SLA if it stays out overnight during winter? I have to leave a bike at the train station everyday and hope to charge it when I get to work in the morning. After charge I will ride to the train(30min), park it in a bike box, ride to work (30min) in the AM. The SLA is 12V 7amphr, currently lights a 50W H3 halogen which gets about 1.25 hrs burn time. Any guesses if I will be able to make the 2 30min commutes? I will change batteries at work with a completley charged SLA each day. On Monday the battery will have been left over the weekend.
    Thanks all. Charlie

  5. #1330
    Recumbent Evangelist
    Join Date
    Mar 2005
    Location
    Kitchener, Ontario
    My Bikes
    Rebel Cycles Trike, Trek 7500FX
    Posts
    2,991
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You may see a reduced run time (lower amp-hours), because the cells are cold. I'd also switch that 50W bulb for a 35W high-efficiency bulb.
    www.rebel-cycles.com

    The official Canadian dealer of TW-Bents recumbent bicycles!

  6. #1331
    Senior Member balto charlie's Avatar
    Join Date
    Aug 2004
    Location
    Baltimore/DC
    Posts
    2,442
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jeff-o
    You may see a reduced run time (lower amp-hours), because the cells are cold. I'd also switch that 50W bulb for a 35W high-efficiency bulb.
    Thanks. I will but have to make the holder. My current light is sealed and the wrong shape. I have scheduled time this weekend to make a few as I have 2 bikes to outfit.

  7. #1332
    I am not a car Map tester's Avatar
    Join Date
    May 2004
    Location
    Decatur, GA
    My Bikes
    '81 Takara Sport Touring, Giant Revel 1, Surly Ogre
    Posts
    748
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by NeezyDeezy
    Do you by any chance know if either of the autoumination MR16 3W Luxeon LED bulbs (normal and wide angle) will fit into the Optronics driving headlights housing (like, QH-8CC or something)?
    I sure hope so, because that is what I have. I'll report back after I get it in.

    Quote Originally Posted by balto charlie
    What happens to an SLA if it stays out overnight during winter?
    If it is fully charged it shouldn't make too much of a difference. I park my bikes outside on a carport and haven't noticed a difference (lowest temp around 18 degree F.). I agree that you should get a lower-watt light. I used a 7Ahr SLA two years ago with a 25 watt sealed beam LV505 (Home Depot) and got way over two hours run time.
    "Bad facts make bad laws." FZ

  8. #1333
    Senior Member NeezyDeezy's Avatar
    Join Date
    Jun 2006
    Posts
    880
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Map_Tester, I could be wrong, but I think I remember someone in one of these threads reporting that those LED MR16s won't properly fit in the Optronics housing, you might want to look into that, but I guess since they're on the way already you can probably find some solution that will work.
    Last edited by NeezyDeezy; 10-26-06 at 02:45 PM.

  9. #1334
    Senior Member
    Join Date
    Sep 2006
    Posts
    353
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    hey, im wondering about LEDs and resistors. I have 2 volt LEDs and am going to run them in groups of 6 for 12 volts, but I am concerned about the upper end of the voltage spectrum for my batteries. 12 volt sealed lead acid battery can have up to what starting voltage? just wondering to know if I will need resistors to keep the life of my leds long, or at all.

  10. #1335
    500 Watts kill.cactus's Avatar
    Join Date
    Aug 2006
    Location
    Ann Arbor, MI
    My Bikes
    Trek 7200 FX ('05), Trek 6000 ('07)
    Posts
    833
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    http://www.members.optusnet.com.au/r...DIY_Lights.htm


    http://www.bike-recumbent.com/headlight.shtml


    http://www.instructables.com/id/E3BGQT6Y7PEP286N6P/


    I'm fed up with looking for a light that is good and sub 50 dollars - probably b/c there aren't any.

    So I'm going to try and make my own in the next few weeks with a 20 or 35 watt MR15 halogen from http://www.peclamp.com/buymr16color.html

    and I'm going to try and get a cool look with some baked bean cans as housing

    Next - off to a Batteries Plus store to find a battery! woot!

  11. #1336
    Recumbent Evangelist
    Join Date
    Mar 2005
    Location
    Kitchener, Ontario
    My Bikes
    Rebel Cycles Trike, Trek 7500FX
    Posts
    2,991
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Adiankur
    hey, im wondering about LEDs and resistors. I have 2 volt LEDs and am going to run them in groups of 6 for 12 volts, but I am concerned about the upper end of the voltage spectrum for my batteries. 12 volt sealed lead acid battery can have up to what starting voltage? just wondering to know if I will need resistors to keep the life of my leds long, or at all.
    Up to 13.5-14V.
    www.rebel-cycles.com

    The official Canadian dealer of TW-Bents recumbent bicycles!

  12. #1337
    Recumbent Evangelist
    Join Date
    Mar 2005
    Location
    Kitchener, Ontario
    My Bikes
    Rebel Cycles Trike, Trek 7500FX
    Posts
    2,991
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by kill.cactus
    and I'm going to try and get a cool look with some baked bean cans as housing
    I think you should try to preserve the tin-can look by carefully removing the wrapper, then re-gluing it with strong glue. Then coat it with several layers of laquer to keep it looking good, and to prevent the can from rusting.

    www.rebel-cycles.com

    The official Canadian dealer of TW-Bents recumbent bicycles!

  13. #1338
    I am not a car Map tester's Avatar
    Join Date
    May 2004
    Location
    Decatur, GA
    My Bikes
    '81 Takara Sport Touring, Giant Revel 1, Surly Ogre
    Posts
    748
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by NeezyDeezy
    Map_Tester, I could be wrong, but I think I remember someone in one of these threads reporting that those LED MR16s won't properly fit in the Optronics housing, you might want to look into that, but I guess since they're on the way already you can probably find some solution that will work.
    Well NeezyDeezy, you were right about the size. I was able to fit it into the Optronic housing by drilling a small hole through the small overlap between the front and back of the housing. The LED light does not throw as strong a beam as the halogen, but works great as a to-be-seen light. I think I can now experiment with smaller/lighter batteries. Also, you can see how I mount the light by using a Minoura Bottle Cage Holder, and sawing off the 'wings' that the water bottle screws into.
    Attached Images Attached Images
    "Bad facts make bad laws." FZ

  14. #1339
    Life is good RonH's Avatar
    Join Date
    Jan 2001
    Location
    Between Crystal River and Hernando, Florida, 6 miles west of the Withlacoochee Trail
    My Bikes
    I've had several since 1999 but have settled on my beloved 2001 Litespeed Tuscany and my latest, a 2015 Cannondale Supersix EVO
    Posts
    13,903
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    I moved my batteries from the rear rack to one of the water bottle cages. Having the batteries mounted on the rack made the bike "back-heavy" and ackward when carrying it up and down the stairs at work.
    For now I have the batteries secured in a tennis ball can in the bottle cage. No pictures yet. The tennis ball can is the same diameter as a water bottle and is waterproof.



    Does anyone know of a "straight" (no narrow neck) water bottle or similar waterproof container that I could use instead of the tennis ball can?
    My bikes: 2001 Litespeed Tuscany---2015 Cannondale Supersix EVO carbon

    I thought of that while riding my bicycle -- Albert Einstein

  15. #1340
    52-week commuter DCCommuter's Avatar
    Join Date
    Mar 2005
    Location
    Washington, DC
    My Bikes
    Redline Conquest, Cannonday, Specialized, RANS
    Posts
    1,929
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by NeezyDeezy
    Map_Tester, I could be wrong, but I think I remember someone in one of these threads reporting that those LED MR16s won't properly fit in the Optronics housing, you might want to look into that, but I guess since they're on the way already you can probably find some solution that will work.
    I'm running a MR16 LED in the optronics housing. The crucial dimension is the depth of the bulb, the connector is right up against the back of the housing. It looks like Map Tester's bulb is a little deeper than normal. If the bulb protrudes in the front it's not a problem as the housing is open on the front.
    The United States of America is the only democratic nation in the world to deny citizens living in the nation's capital representation in the national legislature. District residents have no vote in either the U.S. Senate or U.S. House of Representatives. www.dcvote.org

  16. #1341
    spinspinspinspin fatbat's Avatar
    Join Date
    Nov 2004
    Posts
    880
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Map tester
    Well NeezyDeezy, you were right about the size. I was able to fit it into the Optronic housing by drilling a small hole through the small overlap between the front and back of the housing. The LED light does not throw as strong a beam as the halogen, but works great as a to-be-seen light. I think I can now experiment with smaller/lighter batteries. Also, you can see how I mount the light by using a Minoura Bottle Cage Holder, and sawing off the 'wings' that the water bottle screws into.
    shoot- i'm waiting on a 3X3W cree Led mr16, and was planning on running it in the optronics housing.

    The problem is that the bulb is too long, and thus not enough overlap for the threads on the faceplate?
    a radar blip, an empty clip, post-nasal drip, and kung fu grip

  17. #1342
    52-week commuter DCCommuter's Avatar
    Join Date
    Mar 2005
    Location
    Washington, DC
    My Bikes
    Redline Conquest, Cannonday, Specialized, RANS
    Posts
    1,929
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Adiankur
    hey, im wondering about LEDs and resistors. I have 2 volt LEDs and am going to run them in groups of 6 for 12 volts, but I am concerned about the upper end of the voltage spectrum for my batteries. 12 volt sealed lead acid battery can have up to what starting voltage? just wondering to know if I will need resistors to keep the life of my leds long, or at all.
    LED's are funny creatures. They don't operate as a fixed resistance the way that light bulbs do, they're more like on-off switches. The voltage rating on a LED is the "forward voltage." If the voltage applied is greater than the forward voltage, the LED turns on. If the LED is on in a circuit with no resistance, you have a short circuit, and something will burn up.

    What you need to include is a "current-limiting" resistor, which goes in series with the LED to limit current in the circuit. To size the resistor, you need to know three things: the forward voltage of the LED, the maximum supply voltage, and the maximum current the LED can take. As an example, assume you have a 12 volt nominal SLA battery that produces 14 volts at full charge, and six LED's with a forward voltage of 2V and a maximum current of 100 mA. The LED's will always drop their forward voltage, so 12V will drop over the LED's, and the remaining 2V will drop over the resistor. The current through the resistor is the same as through the LED's, so it can be no more than 100 mA. Using Ohm's Law to solve for 2V @ 100mA gives a resistance of 20 ohms. To buy a resistor you need to know its resistance, and also its power, so solving Watt's Law for 2V and 20 ohms gives .20 watts.

    With a current limiting resistor, there is always some efficiency loss. The efficiency is given by (forward voltage)/(supply voltage). Note that the value of the resistor does not affect the efficiency.

    As the supply voltage drops, the efficiency increases, but the power output decreases. The power output is given by (Power at maximum voltage)*(Supply voltage-Forward voltage)/(Maximum voltage-forward voltage). Note that when the supply voltage reaches the forward voltage -- 12 V in our example -- the power drops to zero and the LED shuts off. Again, the value of the resistor does not affect this equation.

    So when you are designing your circuit, what is important is the range of the supply voltage and the forward voltage of your LED's. You have to make a compromise. The lower your forward voltage, the more even the output will be over a range of voltages and the lower your shut-off voltage. However, the higher the forward voltage, the more efficient your light is.

    As a reference point, I have some LED truck taillights and they are 4 LED's with a combined forward voltage of 8V. The designer chose stability over efficiency.

    In an efficiency-crucial application like bike lighting, it probably makes sense to use a voltage regulator. But that's another topic.
    The United States of America is the only democratic nation in the world to deny citizens living in the nation's capital representation in the national legislature. District residents have no vote in either the U.S. Senate or U.S. House of Representatives. www.dcvote.org

  18. #1343
    Senior_Member2 diff_lock2's Avatar
    Join Date
    Apr 2006
    Location
    Finlando NOT: Orlando, Fl
    My Bikes
    Beater + Nishiki Bigfoot X-29
    Posts
    1,694
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hey, thanks about the wasted energy hint. Ill look around for red LED MR 16's, here in finland..

  19. #1344
    I am not a car Map tester's Avatar
    Join Date
    May 2004
    Location
    Decatur, GA
    My Bikes
    '81 Takara Sport Touring, Giant Revel 1, Surly Ogre
    Posts
    748
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by RonH
    Does anyone know of a "straight" (no narrow neck) water bottle or similar waterproof container that I could use instead of the tennis ball can?
    Have you thought of using 2 1/2" plastic drain pipe with cap fittings on the ends? Would your batteries fit?
    "Bad facts make bad laws." FZ

  20. #1345
    Packfodding 3 caloso's Avatar
    Join Date
    Jul 2002
    Location
    Sacramento, California, USA
    My Bikes
    Ridley Excalibur, Gazelle Champion Mondial, On-One Pompino, Specialized Rock Hopper
    Posts
    30,310
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Mounting question:

    I am building up a fixie for winter commuting/training and since I have no need for the downtube cable/shifter bosses, I was thinking they may be a great attachment point for lights. It would be close to the bottle battery so wiring would be short and sweet and it would keep the bars clean. Plus, it would illuminate the front wheel and let folks know "bike!"

    Has anyone done this?
    Cyclists of the world, unite! You have nothing to lube but your chains!

  21. #1346
    Life is good RonH's Avatar
    Join Date
    Jan 2001
    Location
    Between Crystal River and Hernando, Florida, 6 miles west of the Withlacoochee Trail
    My Bikes
    I've had several since 1999 but have settled on my beloved 2001 Litespeed Tuscany and my latest, a 2015 Cannondale Supersix EVO
    Posts
    13,903
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Map tester
    Have you thought of using 2 1/2" plastic drain pipe with cap fittings on the ends? Would your batteries fit?
    Thanks for the suggestion. I'll check it out. I guess I need to spend more time at Home Depot.
    My bikes: 2001 Litespeed Tuscany---2015 Cannondale Supersix EVO carbon

    I thought of that while riding my bicycle -- Albert Einstein

  22. #1347
    spinspinspinspin fatbat's Avatar
    Join Date
    Nov 2004
    Posts
    880
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by caloso
    I am building up a fixie for winter commuting/training and since I have no need for the downtube cable/shifter bosses, I was thinking they may be a great attachment point for lights. It would be close to the bottle battery so wiring would be short and sweet and it would keep the bars clean. Plus, it would illuminate the front wheel and let folks know "bike!"

    Has anyone done this?
    Would you smack the lights with your knees when out of the saddle?
    Depends on your bike's geometry, but when i'm on the ends of the bars, my knees are swinging through that area.
    a radar blip, an empty clip, post-nasal drip, and kung fu grip

  23. #1348
    Packfodding 3 caloso's Avatar
    Join Date
    Jul 2002
    Location
    Sacramento, California, USA
    My Bikes
    Ridley Excalibur, Gazelle Champion Mondial, On-One Pompino, Specialized Rock Hopper
    Posts
    30,310
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fatbat
    Would you smack the lights with your knees when out of the saddle?
    Depends on your bike's geometry, but when i'm on the ends of the bars, my knees are swinging through that area.
    I was eyeballing it, and I think it would be okay.
    Cyclists of the world, unite! You have nothing to lube but your chains!

  24. #1349
    Senior Member
    Join Date
    Jul 2006
    Location
    Tucson AZ
    Posts
    584
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Map tester
    Have you thought of using 2 1/2" plastic drain pipe with cap fittings on the ends? Would your batteries fit?
    How long do you suppose it'll be before someone calls in a report that he's lugging a pipe bomb?

    I really want to thank everyone who has contributed to this heroic thread. Tons of great information and inspiration.

    Looking back at page 54, I see that Novakane is assembling halogen lights in plastic pipe, but doesn't have them running yet. Are those plastic housings going to melt, or are they up to that task?

  25. #1350
    52-week commuter DCCommuter's Avatar
    Join Date
    Mar 2005
    Location
    Washington, DC
    My Bikes
    Redline Conquest, Cannonday, Specialized, RANS
    Posts
    1,929
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by caloso
    Mounting question:

    I am building up a fixie for winter commuting/training and since I have no need for the downtube cable/shifter bosses, I was thinking they may be a great attachment point for lights. It would be close to the bottle battery so wiring would be short and sweet and it would keep the bars clean. Plus, it would illuminate the front wheel and let folks know "bike!"

    Has anyone done this?
    I would worry about two things. THe first is having the lights blocked by the front wheel, brake cables, etc. The second is your eyes not being shielded from the light, or the reflection from the items blocking it. But try it, geekiness is all about experimentation. And report back.
    The United States of America is the only democratic nation in the world to deny citizens living in the nation's capital representation in the national legislature. District residents have no vote in either the U.S. Senate or U.S. House of Representatives. www.dcvote.org

Page 54 of 75 FirstFirst ... 444525354555664 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •