Or running an led or set of leds "hotter" than the others? I dont think 2700K white is cool enough, seems 1750K is comercially available? Plus running cobs softer shifts (basically unquantifyably tho) to a cooler spectrum. It seems a fine model considering the heat management system and entire radiation profile is needed to realy make an informed decision? Also shows a nedd imo to obtain broader spectral data for the leds, mfr's dont outright do this i think because of the high dependance on the efdeciency of the thermal managment.
IMO a well blended white base and a few of the longer WV reds and targeted uvr8 is the wayto go. I want to look for a simple and effecient way of doing what I have in my head with adjusting led drive current. I have been avoinding tackling pwm with the arduino because my lack of programming knowledge, I am curious if the "d" series meanwell driver and associated control software would be up to the task?
As color temp goes down ie from 6500k down to 2700k, the spectrum shifts "hotter." The longer the WV the greater the "heat" felt. (Because we're mostly made of water...)
And ya, I'd have to agree, the plants' response to all EM is what's needed to make an informed decision on what the future lighting industry SPDs should be, at least when regarding MJ.
The effeciency of LEDs is described as visual light emmision or photonic emmision vs the power supplied. Whatever power isn't used for visual is expelled as heat or IR. If you expanded the SPD to include all EM including IR, the chip would be 100% effecienct (negating kinetic). The effeciency of the thermal management is part of a greater system and not dependent solely on the chip. In contrast, how much heat/energy needs to be managed intially is dependent on the individual chip, or the chips effeciency. A wide SPD of LEDs would only show varying degrees of IR over time (as it heats up) but wouldn't be damning to the initial effeciency number, rather it would support the initial effeciency claim. What I'm getting at, is that a wider SPD showing IR emmission only confirms that the chip is X% efficient, we already knew that the other Y% was being emitted as waste. You could be right, that they don't want to show wider SPDs because of the way they are marketed as being so effecient, but I think it'd be hard to really determine actual IR SPD considering its dependent based on what the LED is mounted on. If the LED is transferring thermal to a board or a heatsink, the board or heatsink will emit as much IR as the LED gives it thermally. Idk maybe you could determine WV, it would be ambiguous and not a single WV, but your amount of IR or quantity emitted is directly related to temperature. Hmmm... White LEDs are not generating IR through their design though, only through their operating temps. This is key to note. This is in direct contrast to an incandescent or HID, which heat up a filament to a certain degree and once the filiment gets hot enough it gives off visible light, that's why all the IR. An LED isn't heated up to produce light, its electrically exciting doped semiconductors to give off light at certain WV as the semiconductor electron drops from higher energy to lower energy.
FF to 2:27 to where it talks about basic diodes..
EDIT:
This video explains the diode a little more focused at LED..