Im making a light at home, but I have a problem with it. The luxeon star being used to supply the light creates a large bright spot on the top lens in the center, and leaves the rest of the lens mcuh darker. I now need to make a lens to sit over the luxeon star which will defract the light so it lights up the top lens evenly.
Attached is a picture of the light that I made it paint to explain myself better. Im really after the shape of lens that would be required to bend it away from the center (which is where the bright spot is).
Then why not attach your circuit here to your reply, instead of over at ImageCrap.
The LED has a single point of light. The center of the lens is closest to it so is brighter than the edges of the lens which are farther away and so are dimmer.
Use more LEDs.
Ok, what would be the best approach, minimizing the light loss.
What about if I used strips of shiny material (nearly polished stainless or aluminum, or metallized plastic, etc.) to reflect light from the center out to the sides?
Its for a lighting project, Ive been given the luxeon and I need to make a light, and still maintain a high output. My light is a modular light for a bar / club.
what color is the ceiling? If it is a dark bar with a lirght ceiling, a small amount of Rebel stars (normal luxeons suck) aimed at the ceiling would make for wonderful mood lighting.
When I do that with 145Lm you can read by it. It is interesting to note that blue LEDs are much better in scotopic vision (dark adjusted) than anything else. In full scotopic vision, a blue rebel and get to a 900Lm/W effective efficiency.
the Luxeon III Star (3W) and the Luxeon V (5W) have an almost linear radiation pattern of 150degrees, which is 100% along the optical centerline and decreases to 80% 75degrees left and right of it.
To distinguish between the wide band of decreasing brightness it takes measuring devices much more sensitive than a human eye.
If you have a bright spot along the optical centerline of your Luxeon it is definitely NOT a Luxeon.
The screen on top lights up from the LED. The screen lights brighter when the LED is closer, directly below.
The screen lights dimmer at the sides where the LED is farther away and its light is spread over a larger area.
I think even an incandescent light bulb or a compact fluorescent light bulb would produce the same problem.
The screen on top lights up from the LED. The screen lights brighter when the LED is closer, directly below.
The screen lights dimmer at the sides where the LED is farther away and its light is spread over a larger area.
I think even an incandescent light bulb or a compact fluorescent light bulb would produce the same problem.
it makes a big difference what you are trying to do. The normal lamps throw light everywhere. Any light bouncing off a reflector loses 30-50% of it's intensity. Any light that does not go where you want it is an outright loss.
In addition to that, recent sudies have shown that blue heavy light sources allowi the use of lower intensities with reduced eye strain. Of course the CRI is not high, but particularly for industry and office it means lower utility bills.