idea for a true wide angle optic

[hizzo3]

I have been searching for a true wide angle optic (something along a 10-15degx60-80deg half axis). I think i may have found a solution.

http://www.luminitco.com/Light_Shaping_Diffusers.html
this site was posted in another thread on here, and i got to thinking. what if i took a 25deg regular optic, and cut the film they have (like the 95x35) to fit over that optics end.... any ideas before i order my supplies to try it? My goal is to turn 4 lux 1's into tail lights on my motorcycle, and i need to reduce the hot spot, and i think this may do it...

 

[hizzo3]

Buler?

 

[BPH]

Looks like it may work.
However, Khatod has a 15x90 optic for the CREE XR-E. The cree will be much brighter and more efficient than a lux 1. It will be 3x as bright as a lux 1!
See khatod pdf for details on beam pattern etc.;
http://www.khatod.com/pdf/kepl195_7090xre_xlamp_test_report.pdf
-BPH

 

[hizzo3]

well i know they are brigher and more efficient... Keep in mind this will be a tail/brake light and i will be using 4 of them. To use a lux3 i would have to do a PWM at less then 5% to be acceptable and brake would be less then 30% Also do the crees come in red?

 

[Blindasabat]

I have been searching for a true wide angle optic (something along a 10-15degx60-80deg half axis). I think i may have found a solution.

http://www.luminitco.com/Light_Shaping_Diffusers.html
this site was posted in another thread on here, and i got to thinking. what if i took a 25deg regular optic, and cut the film they have (like the 95x35) to fit over that optics end.... any ideas before i order my supplies to try it? My goal is to turn 4 lux 1's into tail lights on my motorcycle, and i need to reduce the hot spot, and i think this may do it...

What's a half-axis? I'm not absolutely sure what you are looking for. Sounds like you want a 15x70 degree optic. Which makes sense for what you are trying to build. Any diffusing tape on the outer lens/cover of the tail-light assembly would do best to diffuse the hot spot. My guess is you would want 10x80 (wide as possible, but not tall) optics with a medium to heavy diffusing film far away from them to diffuse the hot spot. If the plastic lens has angled inner surfaces like many tail-light covers do, then that will help diffuse the hot-spot too, but then it would be very hard to apply diffusion film to the inside surface.

 

[hizzo3]

What's a half-axis? I'm not absolutely sure what you are looking for. Sounds like you want a 15x70 degree optic. Which makes sense for what you are trying to build. Any diffusing tape on the outer lens/cover of the tail-light assembly would do best to diffuse the hot spot. My guess is you would want 10x80 (wide as possible, but not tall) optics with a medium to heavy diffusing film far away from them to diffuse the hot spot. If the plastic lens has angled inner surfaces like many tail-light covers do, then that will help diffuse the hot-spot too, but then it would be very hard to apply diffusion film to the inside surface.

well i was refering to the optic type.. some list their full angle others list their half angle. so the same 15x70 optic can be also 30x140... something i have noticed between all the optics out there. My current tail light has a medium wide angle pillow type optic built in. aprox 1 cm tall and 2 cm wide. I was looking at using the diffusing film on the optic to help 'shape' the light into a wider angle. alot of the wide angle optics seem to have a dead spot in the middle, with hot spots on either side, or just arent wide enough. I guess i should just order a test sample of each and just see what works best. I'll post back what i find. Thanks