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Blurple and magenta LEDs seem to be on their way out last time I looked into growing lights. It is white (or white appearing) LEDs now, which are getting 190+ l
by AngryData 6y ago
Blurple and magenta LEDs seem to be on their way out last time I looked into growing lights. It is white (or white appearing) LEDs now, which are getting 190+ lumens per watt. The light spectrum is still tuned for plant growth efficiency, but it is a broader spectrum per LED rather than more specific spectrums from specific diodes.
It is worth noting too that these newer white LEDs are spectrum efficient enough that people growing with them have had to turn up the overall room temperatures to compensate for the drop in leaf temperatures created by "waste" wavelengths that the sun and old sodium bulbs use to provide.
- klodolph 6y ago190+ lm/W is still less than 50% efficiency. I don't understand how a white lamp can be tuned for plant growth efficiency, could you elaborate?
- AngryData 6y ago50% efficiency is pretty massive for a light or most anything really. And you can get higher if you underdrive them. Just because a light appears white doesn't mean the spectrum is evenly distributed though, generally if you graph the color spectrum of these lights green is in a huge dip. If you go to page 13 of this data sheet they show show spectrum graphs. https://cdn.samsung.com/led/file/resource/2020/09/Data_Sheet_LM301B_CRI80_Rev.10.1.pdf https://cdn.samsung.com/led/file/resource/2020/09/Data_Sheet... All of which appear white in real life. They may be more cool blue white or warmer reddish white, but white nonetheless. Especially with the intensity that they shine.