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Not from these bulbs.

Sorry, I meant ol' traditional HPS spectrum, which without being aircooled, hardly emit any UV at all. Let alone with glass in the way. People been growing crazy frosty bud with old school tech for awhile now. And I'm pretty sure nobody in their right mind is cooling their T5 Fixtures or CFL's...

I completely disagree, as COB's have grown some of the frostiest bud I've ever seen while completely lacking in UV. Trichome production is a secondary metabolite function of the plant and relates to health. UV is not necessary to achieve this. Explain how jacketed Bulbs in air-cooled hoods...

I don't know personally in either scenario, I was hoping you might have some insight haha! I imagine that particular wavelength of IR is an incidental by-product of creating a fuller spectrum by arcing a filament. Just based on the IR regions of HPS, MH, and CMH all having their main peak...

Thanks for the link! I didn't realize that IR past 750nm had that much (albeit relatively low) quantum efficiency. Very interesting.

That was kind of my point..... Not that long ago people shared information freely, in the hopes of pushing the limits of Grow lights. Mostly because of what was available to the public was overpriced, overhyped shit. Now it's a bunch of forum members turned Vendors/ Lighting "Experts" trying to...

Why don't you just drop us that manufactures link in the spirit of DIY?

Are you saying that the 845nm peak in IR energy is by design and not a by-product of the bulb chemistry?

For sure man. I was being totally sarcastic about spectrum as I grow under COBs myself. Sorry if I was confusing.

Already got one from when I was running HPS! Now it barely has to do anything! And boy is my environment as easy to control as ever!

No way bro. COBs have an inferior spectrum because they lack UV/IR, remember? I Should've used DE Tech! :wall: Oh well, I guess this will have to do.

It's an honest question man. Why not hold a tape measure up to show everybody just how much they stretched from the first pic? Not trying to be a dick at all, but how is everybody supposed to get a perspective on what you are trying to show without a frame of reference? How much did they grow...

Are you sure they aren't just 'growing'?

I definitely think you are right. I've done a fair bit of research into the Emerson Effect and the photosystems I & II. I based the ratio of light I chose off the Mccree Action Spectrum as opposed to the solar spectrum. This is why I chose a 3:1 Red:FR ratio. I don't care about extra stretch...

@Randomblame I actually liked the ratio of light that I used. The plants responded well to the added Red/FR. Seemed to keep the leaves perky and pumping out the chlorophyll. That being said, if I could chose a spectrum all over again, I would def choose 3000k 90 CRI for flower. I've always...

I ran 660nm and 730nm during lights on and did NOT notice the stretch everybody keeps talking about. The plants seemed to grow normally or even a tiny bit shorter than I'm used to. The 660 : 730 were in 3:1 ratio and only accounted for about 8% of the total light being created. The rest was a...

Proper Nutrition, Proper Light Intensity, Proper Environment = Healthy Plants;)

I agree that HID tech has the potential to offer a fuller spectrum, but HPS spectrum is no better than warm white phosphor LED's and people can grow healthy plants without deficiencies using either technology. So I'm not entirely convinced that lighting alone, will cause deficiencies. It may be...

What exactly do you consider "full spectrum"? And why?