Gallery of Lights
The Site => General discussion => Topic started by: bryantm3 on May 28, 2013, 02:53:04 AM
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okay, i know some people on here are not fond of LED lights because the light is so directional. however, the directionality of the light isn't even determined by the actual diode, it's from the plastic lens that goes over the diode:
(http://static.ddmcdn.com/gif/led-rev-5.jpg)
so maybe i'm missing something major here, but my first thought was "duh! remove the lens!". secondly, they're trying so hard to produce a white light that won't degrade, and the biggest problem is with the yellow color degrading. why don't they do this— imagine the light taken apart into layers.
the top layer would be a reflector, a mirror of some sort to make sure the light is reflected downwards.
the next layer would be an array of blue LED lights that don't have lenses (blue LEDs are extremely cheap to make, white LEDs are not)
the final layer would be a glass lens coated on the inside with yttrium nitride (the phosphor that's on the inside of DX bulbs).
this way, the light would be cheaper to make and possibly emit more light than a standard LED fixture due to the phosphor coating. in addition, the color would be corrected from the blue light.
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i don't think mercury vapor phosphors would work with LEDs. Just like MV and fluorescent lamp phosphors aren't interchangable since the UV waves they emmit are different. Philips has done what you said with their houshold lamp. it has blue LEDs with yellow plastic panels. I think removing the cover would work like you said. I've been screaming this to the fixture manufacturers since the start of the LED street light take over: ADD A FRIGGIN DROP LENS TO THE STREET LIGHTS!!! Drop lens HID street lights distribute light better than FCO HID street lights so drop lens LED lights will distribute the light better than FCO LED street lights. Or even just some sort of diffuser to cut back on the awful glare that LEDs have when looked at from underneath.
I now have an LED street light and i noticed something else that a refractor/diffuser could correct: the multi-shadow effect. Since there are multiple LEDs, there are multiple light sources and when there's multiple light sources, there's multiple shaows. I'll try to get a pic...