Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Electronics, Lighting, & Gadgets HRM, GPS, MP3, HID. Whether it's got an acronym or not, here's where you'll find discussions on all sorts of tools, toys and gadgets.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-13-07, 01:49 PM   #1
Zero_Enigma
Senior Member
Thread Starter
 
Zero_Enigma's Avatar
 
Join Date: May 2006
Location: North of the 49th Parallel (GPS grid soon)
Bikes: MTB Peugoet Canyon (forgot the model), Nikishi? roadbike, MTB custom build,
Posts: 1,767
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Optics: Reflectors, Collaminators, and lenses. Pro/cons please

As the topic said can someone without giving me a truckload of info on this explain the pro/cons of each briefly?

Which gives the longest tightest throw? I was thinking the IMS20 but got product overload with all the lenses and reflectors and such.

Right now I have Luxeon Ledil L2 5 degree, 15 degree, and 25degree lenses in front of me. I als have a MEC 1W Shark reflector which I took out to test.

Thanks in advance.
Zero_Enigma is offline   Reply With Quote
Old 11-13-07, 06:37 PM   #2
sherpa93
Senior Member
 
sherpa93's Avatar
 
Join Date: Apr 2006
Location: Upper Pooristan
Bikes: 1993 Dorado sherpa
Posts: 90
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This is a good topic. We (and bike light makers) use what is thrown at us. All of the lenses and collimator's have shortcomings for a bike beam. If you havent noticed alot of light goes straight into the trees. Not really usable (unless looking for monkeys) and sure to dazzle cars and peds. An intense narrow spot isnt as useful as it seems. For commuters the ideal would be wide less tall beam with the hotspot smoothed out into usable spill to light up side(s) of road for critters and such. Also a cut off on top to keep light out of trees and drivers faces... As diff lock mentioned in earlier thread its not the lumens its where U put them. And unfortunately this lens/optic does not exist. Im guessing you want the "longest tightest throw" because a 25 deg isnt enough?? And your right.. So you have to experiment. Ive found some success with an 8 deg optics placed behind an old cateye diffuser. Too narrow and intense alone. Add diffuser and the hotspot(s) smooth out and spread into a wide short beam with excellent spill on each side of road. It still retains enough punch for 30mph runs. A small piece of electrical tape across the top can cutoff upward light. This is putting lumens where you need them. Trading an OVER intense spot for some spill without using multiple optics/LEDs. Efficient use of light.
Attached Images
File Type: jpg new no 2 light small DSCF0323.jpg (37.9 KB, 5 views)
File Type: jpg Cree cateye DSCF0512.jpg (48.9 KB, 6 views)
File Type: jpg new no 2 light DSCF0325.jpg (33.5 KB, 8 views)
File Type: jpg new no 2 light DSCF0322.jpg (36.2 KB, 8 views)
sherpa93 is offline   Reply With Quote
Old 11-15-07, 08:05 PM   #3
Zero_Enigma
Senior Member
Thread Starter
 
Zero_Enigma's Avatar
 
Join Date: May 2006
Location: North of the 49th Parallel (GPS grid soon)
Bikes: MTB Peugoet Canyon (forgot the model), Nikishi? roadbike, MTB custom build,
Posts: 1,767
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What optic shouldI be looking for if I want not light spill and want a nice hot throwing spot for cutting fog/darkness for long ranging? This is more for helmet use as I have sketchy people around my neck of the woods and want something to cut down the surprise variables being able to beam them at long range.
Zero_Enigma is offline   Reply With Quote
Old 11-15-07, 09:16 PM   #4
ken cummings
Senior Member
 
ken cummings's Avatar
 
Join Date: Dec 2005
Location: northern California
Bikes: Bruce Gordon BLT, Cannondale parts bike, Ecodyne recumbent trike, Counterpoint Opus 2, miyata 1000
Posts: 5,601
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A clean, tight beam can be had with a PAR36 spotlight bulb that has a shielded filament. The near parabolic rear reflector sends more then half of the light in a tight forward beam. The shield in front of the filament (and inside the bulb) blocks light from spraying off into the trees. The front of the bulb needs to be clear, smooth glass, not one of the molded forms. The 4 1/2" bulb is fitted, usually, in a black rubber holder that can be clamped to your handlebars. Other cyclists could feel the infra-red in my spotlight beam from 10 feet away. There is an incredible array of different beam patterns and power levels.
ken cummings is offline   Reply With Quote
Old 11-16-07, 01:59 AM   #5
Zero_Enigma
Senior Member
Thread Starter
 
Zero_Enigma's Avatar
 
Join Date: May 2006
Location: North of the 49th Parallel (GPS grid soon)
Bikes: MTB Peugoet Canyon (forgot the model), Nikishi? roadbike, MTB custom build,
Posts: 1,767
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by ken cummings View Post
A clean, tight beam can be had with a PAR36 spotlight bulb that has a shielded filament. The near parabolic rear reflector sends more then half of the light in a tight forward beam. The shield in front of the filament (and inside the bulb) blocks light from spraying off into the trees. The front of the bulb needs to be clear, smooth glass, not one of the molded forms. The 4 1/2" bulb is fitted, usually, in a black rubber holder that can be clamped to your handlebars. Other cyclists could feel the infra-red in my spotlight beam from 10 feet away. There is an incredible array of different beam patterns and power levels.
Well I forgot to mention I'm looking for something in the 20mm range to fit into 1" tubing for making a DIY helmet light.
Zero_Enigma is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 10:02 AM.