that article is not accurate, there r no real numbers for comparison, what wattage lights r they comparing.?, what distances r they hung.?, how much air movement.? RH.?
it contradicts itself with the Infrared Pic and the statement…
" Any light that isn’t reflected is absorbed and turned into heat, warming up the leaves, which affects how the plants grow. Our experiments show that the wasted light colors from commonly-used HPS grow lights can keep leaves 10-25 °F warmer than the ambient air temperature, depending on plant type."
if this was true the 200F HPS would be producing 180F leaf temp due to all the “wasted light”, basically all the light from a HPS according to Black Dog.
the Black Dog light is producing 80% of its heat into leaf temp, the HPS is only producing 45% of its heat into leaf temp., but again, we do not know the power output of either…???
it’s graph is also misleading,
“The orange line shows the spectrum of a High Pressure Sodium (it’s even a “blue-enhanced agricultural” HPS) light; you can see how most of its light is in the range people are most sensitive to, and plants are least sensitive to.”
enhanced bulbs r doing better then the old school HID bulbs,
the increase in spectrum has to have something to do with it,
is it because of extra yellow/green, i don’t know, but it seems to help.!!
“showing how our eyes are most sensitive to yellow and green light. This is also the lumen weighting function which is used to measure lux / lumens for a light source.”
lumens r heavily dependent on yellow/green, but to say that is all it measures is false,
i’ve used a lumens meter on Floro, MH, and HPS, according to that article my meter would not ‘see’ half of the old HPS or MH spectrums and read really low,
that is not the case, my meter gives a good idea of light concentration from all sources.!
dbrn, as always, thank u for all your info and knowledge that u share with us,
i used to think that Black Dog was a better Blurple light, but that article turned me totally against Black Dog and their research.!!
i may be missing something, if someone can explain their research to me please do.!!
cant belive my eyes.
25 pants if count clones in veg too.
