LiberalThinker
Well-Known Member
Does it make better, more informational sense to compare lights by how they fill the spectrum under a McCree Curve?
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The McCree curve came to be by measuring the photosynthesis of a species of algae in response to various wavelengths of light. I think there is more to it than just that. One of my arguments is different strains of cannabis reflect wavelengths that differ from other strains. Take the purples for example. They reflect some of the blue and red wavelengths. My gut instinct seems to be valid as a recent study at a Canadian University found it was the intensity of the light that governed the yield, not the spectrum. Here's the link: The Impact of Light Intensity and Spectrum-Tuning on Cannabis Yields
They used broad spectrum lights, and compared them with blurples and HID lights.So, any old photons then, as long as there's lots of them? That would make sodium tops then. If one says 'white light', it's obvious that will be the best light because all wavelengths are equally produced and there ain't no light yet with a CRI of 100.
what's a broad spectrum light? Examples would clarify. I would call a cmh 930 broad:They used broad spectrum lights, and compared them with blurples and HID lights.
Pick any Timber or HLG light. The 'white' LEDs and COBs used in these fixtures are mass produced for other lighting markets, but are used by these manufacturers for horticultural purposes.what's a broad spectrum light? Examples would clarify. I would call a cmh 930 broad:
Right, OK cheers.Pick any Timber or HLG light. The 'white' LEDs and COBs used in these fixtures are mass produced for other lighting markets, but are used by these manufacturers for horticultural purposes.
That's interesting. Maybe it requires certain wavelengths to produce the terpenes.Yeah I'd say power is much more important than spectrum for yield. I've got 10 year old mars LEDs that they stopped making before I even started growing. Fucking useless on paper but still drop 20oz per meter at 480w. The buds definately not as good as when I go CMH then hps to get a better spectrum but theres just as much of it.
Yeah something like that mate. I get much frostier buds under 2700k hps compared to whatever the blurples are. Blurples are my favourite veg lights though.That's interesting. Maybe it requires certain wavelengths to produce the terpenes.
That's interesting. Maybe it requires certain wavelengths to produce the terpenes.
Yeah, true. I definitely won't be buying blurples, even though Barney finds them ok for veg. I just can't stand the colour of them. Interestingly, the shop I got my CMH from has gone all out for CMH and made a website specifically for it. I got chatting to the owner because he sent me the wrong bulb and I rang him about it. He says I'll be well impressed.I really don't know. There is a lot we still need to learn about how light affects plants. We may get indications from home growers, but that will come as a byproduct of our hobby. Most of us can't run true side by side comparisons, and run the tests to find out exactly what's in our harvests. These will need to be run by research facilities.
Yeah, true. I definitely won't be buying blurples, even though Barney finds them ok for veg. I just can't stand the colour of them. Interestingly, the shop I got my CMH from has gone all out for CMH and made a website specifically for it. I got chatting to the owner because he sent me the wrong bulb and I rang him about it. He says I'll be well impressed.
Yeah, I imagine it's a big deal in some countries. Here in Blighty we don't see above 25C often. I could quite happily grow all the time on this Phillips Sodium Green Power 600w but I imagine the CMH is better. Shall find out soon. This is my plant under the Philips dimmed to 250w. I've photographed it under T5's for better colour:I don't doubt it. I have to be careful about heat in summer as I don't have air conditioning. That's one area where solid state devices come out ahead. During the winter months, I wouldn't mind so much as the heat and humidity of the tent can be vented into the house and used there.
Interestingly, the shop I got my CMH from has gone all out for CMH and made a website specifically for it. I got chatting to the owner because he sent me the wrong bulb and I rang him about it. He says I'll be well impressed.
Nice idea but he's UK-based and it's not legal. Apart from that, he doesn't know what I grow, although I strongly imagine he's not naive as to the interest of the majority of his clientele. If it ever seems appropriate I'll ask him.Do you suppose he'd be interested in becoming a forum sponsor/advertiser? I don't think there are any entities on our list of forum sponsors that specialize in ceramic metal halide lighting. (But I could be mistaken.)