Mission Statement: Design a high CRI LED for a macro algae tank capable of simulating solar radiance over the course of a day.
Additional Requirements:
General thoughts and questions for the community:
Cool white + Warm white combo chips - Initially I was considering using combination COB boards like these
or
or a cree 30-50W combo board with a string of ww/cw.
The problem is that the cool white is almost always a poor performing...same as always...terrible green yellow gross cool white. This can be partially avoided by creating a multiboard using Nichia 4500k 90+CRI and a nice 2700k but all 2700's I've found are too yellow without enough red.
Prebuilt tunable LED's - I haven't been able to find many of these but there exist prebuilt cobs that can be tuned from low to high temperatures
The benefit is that a high CRI can be maintained throughout the color temperature range. The down side is that it would require a complex control / power configuration resulting in a much larger end package than I'm looking for.
Similarly RGBW leds offer the ability to tune one chip to a color temperature with a high "cri" but the color would still leave gaps and the resulting spectrum would be peaky.
What I'd really like to find is a RGBW chip that uses PC blue Cyan for the blue, PC amber, and PC lime in addition to a high cri full spectrum warm white (2700-3000k)
it seems that this exists - http://www.digikey.com/en/articles/...e-green-leds-encourage-color-tunable-lighting However, I have not been able to find a prefabbed part.
Best option may be to configure a 4-6 up board here http://www.luxeonstar.com/Rebel-Quad-LED-Assemblies_c_4723.html
Very interested in any thoughts / opinions on this design
Additional Requirements:
- CRI and R9 must be above 90 throughout the temperature range
- Color value should remain just south of the black body curve for better reds
- CCT minimum range must be 2700 to 4600
- CCT prefered range would be 1900 to 5600
- output must be at least 1000 lumens throughout the range
- 2 channel control is prefered for simplicity
- UV extension to 400nm and IR extension to 700nm is prefered - no extension needed beyond this
- Minimal emitter count is preferred (Warm white + Lime / ww + cw)
- Small footprint is essential
General thoughts and questions for the community:
Cool white + Warm white combo chips - Initially I was considering using combination COB boards like these
The problem is that the cool white is almost always a poor performing...same as always...terrible green yellow gross cool white. This can be partially avoided by creating a multiboard using Nichia 4500k 90+CRI and a nice 2700k but all 2700's I've found are too yellow without enough red.
Prebuilt tunable LED's - I haven't been able to find many of these but there exist prebuilt cobs that can be tuned from low to high temperatures
The benefit is that a high CRI can be maintained throughout the color temperature range. The down side is that it would require a complex control / power configuration resulting in a much larger end package than I'm looking for.
Similarly RGBW leds offer the ability to tune one chip to a color temperature with a high "cri" but the color would still leave gaps and the resulting spectrum would be peaky.
What I'd really like to find is a RGBW chip that uses PC blue Cyan for the blue, PC amber, and PC lime in addition to a high cri full spectrum warm white (2700-3000k)
it seems that this exists - http://www.digikey.com/en/articles/...e-green-leds-encourage-color-tunable-lighting However, I have not been able to find a prefabbed part.
Best option may be to configure a 4-6 up board here http://www.luxeonstar.com/Rebel-Quad-LED-Assemblies_c_4723.html
Very interested in any thoughts / opinions on this design
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