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This is not true though. You do not get a hot spot in the center, you get less light around the walls because light is lost on the walls. This might sound like potatoes potatoes, but if the space is big enough you will see a perfectly uniformly lit "center" of big proportions and still only a...

Yes, I'm saying you take the spectrum of a Tungsten calibration bulb (which are generally used for calibrating spectrometers). Then you can compare that spectrum measurement to the known spectrum of that bulb. Which then gives you a correction curve which you can apply to all your measurements.

Ah ok, because in this test the coating is 2mm thick it absorbs so much light. But the leds we buy are already covered by a protective silicone coating. Which is much thinner. Still, I would not like to put any coating on top of the silicone coating.

The only thing I can imagine that thickness has an effect is for heat distribution through the heat sink. For instance a very hot COB will benefit from a thicker base of the heat sink to make sure the heat can actually be transported away from the COB. It needs to spread out over the heat sink...

Why? It doesn't really explain that the chart is after any effect? Or is that on a clean surface? You might not "need"PU coating since the environment isn't that harsh, but if it's not losing 15% of the light it would seem a much better material for coating our leds. If we could pry off the...

Now you are comparing different materials. That's not a fair comparison. If you compare a 1mm strip to a 3mm strip as heatsink, they will run pretty much the same temperature since the surface area is almost the same. For dissipation of heat only the surface area is relevant. Adding 2mm of...

They tell you to calibrate wavelengths using a CFL, because of it's know peaks. Then you can "calibrate" intensity by using a know light source. Like with one of those tungsten calibration bulbs. I checked an Osram the 730nm led and this looked to actually peak around 715nm.

Just continue few minutes further to 21:00. I took this screen cap: And then we have this study where the outcome supposedly shows that indeed all photons are created equal and that given the same intensity, the spectrum (or at least it's content in blue light) does not matter for Cannabis...

If you are growing lettuce yes. Like I said above, that video shows that FR does not increase photosynthesis more than other photons and that the reason for extra growth in lettuce is it's shade avoidance. So if shade avoidance (in case of cannabis that would be stem elongation) is not what...

So what this clip shows: Is that there is no difference in photosynthesis from FR or 400-700nm photons. Adding FR photons into the total count (right chart) just shows the same line as with the usual PAR photons: After that chart he explains the reason for the increase in growth is shade...

Always go with something with led strips. All others are lesser options by design. Led strips offer the optimal distribution of light. Much better than with COBs and boards (while 4 COBs are still better than 1 board).

Yes it looks like there are three slots and you would correctly use the two outer ones for the X2 configuration.

That's a often accepted misconception yes. Still a misconception though. You ARE losing more light on the walls with the lights closer to the walls. So you are giving the plants less light overall. That's a given. When you have good distribution you don't have a hot spot with properly spaced...

The title suggests you are using an X3 though. It's odd just leaving oput a strip though. The spacing should be different if there are 2 or 3 strips and just leaving out the middle one wouldn't give you the correct spacing for 2 strips with too much light on the walls. Or vice versa, simply...

It's "fine" yes, but 2 strips or 4 COBs is a much better alternative. I'm saying this because I do know what I'm talking about..

Don't do a single quantum board in a small tent. They need to hang too high and then you lose at least 40% of the light on the walls. Get 2 strips or 4 COBs for much better uniformity, lower hanging hight and ultimately more light on the plants for less money.

Vertical walls dissipate more heat. So I would get a U channel over a flat bar. There are formula to calculate the total dissipation for a heat sink based on surface measurements.

My plants have no trouble dealing with 24 hours of light at all. I leave them like that for months. Both for mother plants and plants in veg phase. Cannabis plants are C3 plants. They do NOT need sleep. If your plants are yellowing then they are probably underfed. You do need to realize that...

It could simply mean that the plants under light spectrum "A" needed a while longer to fully ripen. Perhaps UV slows down ripening a tiny bit.

Isn't CBG th precursor to other cannabinoids (CBD, CBN and THC)? Perhaps the high CBG samples were harvested prematurely and if left to go longer, more of the CBG would have been converted