Fraen LED lenses

[Michael]

By chance, has anyone used these before?

They make a lens specifically for the Luxeon 1 watt stars.

I've been trying to eliminate the "hot spots" and have tried everything from
mounting the LED's backwards....you name it.

I'm trying to backlight a 7" by 7" white acrylic square.

Fraen has a pricey wide angle lens available and wonder if this may do the
trick.

Anyone have experience with them? ......THANKS.

 

[Rich Grise]

By chance, has anyone used these before?

They make a lens specifically for the Luxeon 1 watt stars.

I've been trying to eliminate the "hot spots" and have tried everything from
mounting the LED's backwards....you name it.

I'm trying to backlight a 7" by 7" white acrylic square.

Fraen has a pricey wide angle lens available and wonder if this may do the
trick.

Anyone have experience with them? ......THANKS.

Get a piece of clear acrylic, have one side frosted, and light it from
the edge.

Good Luck!
Rich

 

[Michael]

That's a new one...I think I've tried everything and a number of different
materials.

I have some matte finish (and frosted) in the shop.

Are you saying just shoot the light right into the edge?

Maybe 1/4" material would be best in that case?

Sounds interesting. At 1/4" I could actually drill a hole into the edge for
the LED to fit in ?

 

[martin griffith]

That's a new one...I think I've tried everything and a number of different
materials.

I have some matte finish (and frosted) in the shop.

Are you saying just shoot the light right into the edge?

Maybe 1/4" material would be best in that case?

Sounds interesting. At 1/4" I could actually drill a hole into the edge for
the LED to fit in ?

Been looking at the luxeon stuff as well, just for interest.
I think if you need to light an edge lit sheet you need to use the
batwing config., which shoot out of the side, parallel to the PCB
plain, not the lambertian types. But it seems that you will loose
photons, that point to the nearest edge. ( I could be wrong!)

I find the Luxeon site quite confusing, very difficult to choose a
type


martin

 

[[email protected]]

That's a new one...I think I've tried everything and a number of different
materials.

I have some matte finish (and frosted) in the shop.

Are you saying just shoot the light right into the edge?

Maybe 1/4" material would be best in that case?

Sounds interesting. At 1/4" I could actually drill a hole into the edge for
the LED to fit in ?

If you try placing the LED in the hole you drill in the plastic....have
a fire extinguisher handy. They get extremely hot............. I have
"back-lit" various size panels with LED's but I have placed them so
that they 'reflect" off the back/sides and are facing the rear/sides
with a white cover over them. I use several standard 5mm LED's instead
of one Luxeon. Try different LED output angles and move them around,
you should be able to make it work. Most all of the LED Signs made
today use this technique.
Good luck.

 

[Michael]

Yeah, I'm to the point of switching to 5mm devices and see what happens.

I've found you have to mount on the top and bottom of a box shotting up and
dpwn and then try to eliminate those hots spots....less problematic. My box
is only 2.5" deep.

The Luxeons are just too powerful.....maybe 4 or 5 T1/34 in a row top and
bottom may work out better.

I'll try the edge lighting trick today.

Thanks guys.