New here / questions

[Salami-Vice]

New to the forums,

I am hoping for some assistance. I work for a company that does air field lighting, we recently lost the guy in charge of our light design, and I was forced to become an optic engineer.

We use Rebel LED's for most of our products, and Cree on others depending need.

This particular product, has interesting specs

We need to provide a horizontal spread of +- 35 deg, and a vertical of 1-10 degrees. Through out this area we need to maintain a minimum of 1,000 cd, yellow (amber).

Original design involved a lens integrated to a prism to get my spread and culminate the light of the wide spread LEDs. Problem we had is due to the dimensions we where unable to keep the tolerances in Glass. And plastics are out of the question. These lights get submitted to chemical baths, 300mph jet wash wind, and 255 ton airplanes landing at 150mph.

So the new idea is a series of reflectors to gather my light and then get my optics through a prism which I can simplify and make from glass.


So anyone know of any good reflectors, for the Rebel. We where using lenses from FRAEN, but they suck at providing data I require for my software, so i am willing to try anyone else.


Thanks in advance for the support, and I hope I can contribute as much as I can to this forum.

 

[saabluster]

New to the forums,

I am hoping for some assistance. I work for a company that does air field lighting, we recently lost the guy in charge of our light design, and I was forced to become an optic engineer.

We use Rebel LED's for most of our products, and Cree on others depending need.

This particular product, has interesting specs

We need to provide a horizontal spread of +- 35 deg, and a vertical of 1-10 degrees. Through out this area we need to maintain a minimum of 1,000 cd, yellow (amber).

Original design involved a lens integrated to a prism to get my spread and culminate the light of the wide spread LEDs. Problem we had is due to the dimensions we where unable to keep the tolerances in Glass. And plastics are out of the question. These lights get submitted to chemical baths, 300mph jet wash wind, and 255 ton airplanes landing at 150mph.

So the new idea is a series of reflectors to gather my light and then get my optics through a prism which I can simplify and make from glass.


So anyone know of any good reflectors, for the Rebel. We where using lenses from FRAEN, but they suck at providing data I require for my software, so i am willing to try anyone else.


Thanks in advance for the support, and I hope I can contribute as much as I can to this forum.

There is a bunch of missing information here. Have you looked at lenses like these? Not sure if this is going on the plane or on the ground. Also not sure of the size of the housing. Why can't you use a plastic part to give you the collimation you need and cover it with a glass lens for protection?

 

[Salami-Vice]

There is a bunch of missing information here. Have you looked at lenses like these? Not sure if this is going on the plane or on the ground. Also not sure of the size of the housing. Why can't you use a plastic part to give you the collimation you need and cover it with a glass lens for protection?

Lenses i have looked at come from FRAEN, part # FLP-N4-RE-HRF

This is a taxi way light, meaning an airplane will land on it all 255 tons of it, similar to this:

The problem comes in the fact that the Lenses cannot stick up of the ground surface more than 1/4 of an inch. and through this lens window which is only 2 inches by 1/4 tall max you have to meet the specific parameters. The enclosure itself is only 12 inch in diameter.



So I can make the prim fit that window and give me what i need as far as an optical pattern goes. What i cannot do is get my LED to focus so that I don't loose so much light.

The Fraen lens above has a spread of 11 degrees total (5.5 off axis) and a gain of 23cd/lm peak, and half of that at the extremities.

So... With my amber LEd running 130lm, I can get almost 3000cd peak, and 1,500 off axis at the 11 deg mark. If I use two side by side, I can guarantee going down to 1,000 candela after I loose almost 50-60% through the prism.

The prism has to be glass, plastic gets scratched far to easy in the paivment, and with the chemical baths of the northern countires to melt the ice.


What I was asking is if anyone knows of any copany that makes reflectors of rebel or lenses. FRAEN does not provide me the data I require to be able to run my designs through LightTools.

 

[rmteo]

You can try companies that specialize in the design/fabrication of custom optics:

http://www.gsoptics.com/index.asp
http://www.plasticoptics.com/index.html
http://www.apollooptical.com/polymer_inj_molded_op.asp
http://www.alignoptics.com/