Cheap, powerful rear light?
03-12-09, 08:47 AM
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Cheap, powerful rear light?
I have come across this light, but I haven't bought one or seen one. Anyone know anything about them?
https://www.dealextreme.com/details.dx/sku.20333
https://www.dealextreme.com/details.dx/sku.20333
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03-12-09, 08:52 AM
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looks promising, nice find.
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
03-12-09, 11:02 AM
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Dang it...just when I thought I was all set with my rear lighting, this pops up. Maybe a couple of these attach to the seat stays. 
03-12-09, 11:06 AM
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Just bought one of these as well - Glass Optic
03-12-09, 11:43 AM
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tell us how it goes.
but I'm curious, why a converging lens?
but I'm curious, why a converging lens?
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
03-12-09, 11:45 AM
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I have come across this light, but I haven't bought one or seen one. Anyone know anything about them?
https://www.dealextreme.com/details.dx/sku.20333
https://www.dealextreme.com/details.dx/sku.20333
Way Too Short.
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03-12-09, 11:55 AM
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03-12-09, 11:56 AM
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the 1hr run time is probably inaccurate because the power draw and run time don't add up according to the posts on DX.
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
03-12-09, 11:58 AM
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then wouldn't you want a diverging lens?
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
03-12-09, 11:59 AM
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I'm pretty sure that's a mistake.
Red LEDs are usually lower voltage than white, also they claim 800mA regulated which would probably give more like 3 hours.
Personally I suspect the LED is receiving less than 800mA and runtime will be proportionally longer.
If it is running at 800mA expect dinotte levels of brightness !!
However, I'll let you know when it arrives...
Red LEDs are usually lower voltage than white, also they claim 800mA regulated which would probably give more like 3 hours.
Personally I suspect the LED is receiving less than 800mA and runtime will be proportionally longer.
If it is running at 800mA expect dinotte levels of brightness !!
However, I'll let you know when it arrives...
03-12-09, 12:16 PM
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Ok, here's some specs: Luxeon K2 red LED
Lumens 75 lm @ 700mA, 45 lm @ 350mA.
Max Continuous Current 700 mA
Forward Voltage 3.4 Vf
Dominant Wavelength 627 nm
LED Type K2
Radiation Pattern Lambertian
Weight 0.78g
Due to thermal management I suspect it's more likely to be about 500mA than 800mA.
Also all the torches I've bought from DX so far have been below the claimed power rating.
Runtime tests, volt and amp measurements to follow.....
Lumens 75 lm @ 700mA, 45 lm @ 350mA.
Max Continuous Current 700 mA
Forward Voltage 3.4 Vf
Dominant Wavelength 627 nm
LED Type K2
Radiation Pattern Lambertian
Weight 0.78g
Due to thermal management I suspect it's more likely to be about 500mA than 800mA.
Also all the torches I've bought from DX so far have been below the claimed power rating.
Runtime tests, volt and amp measurements to follow.....
03-12-09, 02:37 PM
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depends on how you want to use it, collimator, converging and diverging lenses.
the curved mirror collimator on the light seems to give a nice beam angle from the shots on the site.
depending on the power it has, it might even be nice to use a diffusion lens on it.
the curved mirror collimator on the light seems to give a nice beam angle from the shots on the site.
depending on the power it has, it might even be nice to use a diffusion lens on it.
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
03-12-09, 05:22 PM
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Looks like it has a simple O/P reflector in it, to me.
03-13-09, 10:24 AM
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$10. Free shipping. That's a find.
I've been looking for something like this -- a rear light to run on 18650 batteries.
I've been looking for something like this -- a rear light to run on 18650 batteries.
03-13-09, 05:15 PM
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not a clue.
Converging or flat lens is the norm since the diverging part is easily attained by just removing the collimator.
Converging or flat lens is the norm since the diverging part is easily attained by just removing the collimator.
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
03-13-09, 05:30 PM
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I do have similar size ultrafire torches here and removing the reflector while wasting a lot of light allows a wider angle cone of light to be emitted - however it isn't anywhere near wide angle as a cycle rear light.
I'm hoping it will be possible to harness all the light output and direct it where required.
I'll experiment more when the torch arrives.
It may well be that better results can be achieved if the assault crown didn't block so much light.
EDIT: Interestingly, I just realised that the red Luxeon LED is a Lambertian so most of the emitted light is going to go straight out the lens without touching the reflector anyway, so removing the reflector will have much less effect than it does on my white LED Ultrafire torches.
Last edited by Unknown Cyclist; 03-13-09 at 05:49 PM.
03-15-09, 06:08 AM
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Planet Bike's "blinky "Super Flash.." They are amazing.
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03-15-09, 06:22 AM
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03-15-09, 07:06 AM
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