Picked up 2 kinsgrbite 240W panels, and a HLG550 recently. Thought this would be a game changer for me. as far as quality, and electrical efficiency, grams per watt, etc.
First Bloom Run complete failure so far. Was using the 2x kingsbrite mixed with a 630W CMH in my bloom room. Temps at 68-72F. Lights on Starts at 68, and few hours later is at 70-72 remainder of day. I knew it was on the lower end, and not ideal. I read that you get more dense flowers with lower temps, as well as more terpene preservation. So I though great, I can handle maybe a little slower growth, or less yields, the quality should be excellent still. I also had very very good VEG growth with them under the HLG 550, with the same temps, and though ok, flowering, they recommend lower temps than VEG, so I should be just as good if not better off, with the same temps. And exhaust fan is turned down as much as possible while keeping humidity in check.

WELL... Fast forward to DAY 30 FLOWER. Flower development extremely slow and small and few, little trichome production, no resin production. Normally by 3 weeks you can get a pretty good idea of the type of smell they profile they will have, but they literally don't smell like anything when you squeeze, it gives nothing off.
The irony is that they are "super healthy" praying leaves, no def's, and great stretch as far as hight and branch production.

Measured the Leaf Surface temp, and it is the same as Room air. So basically 0 Infra Red Radiation warming them up.


It has nothing to do with strain, as I have 4 other strains in here, that are doing same thing. And I have actually grown this strain before so knew what to expect. It is Lime Gorilla Bubble.


Yesterday I put in a space heater running at 380W and it brought temps to 76-77. But it really sucks heating all that air, and then exhausting it to outside. What a waste. I rather use the hps that puts out more infra red spectrum etc which is great for blooming.

So today I replaced the CMH 630W with my HPS1000, and temps are at 76-78F PERFECT! So an HPS is actually more effecient than CMH+Space heater.


I researched LEDS reading and watching for at least 30+ hours, not one single person said yeah they are good, and make sense financially IF, and only IF you need to get your temps down with your current lights.

So the way I see it now, I will need to use my HPS/CMH in WINTER, HPS/LED in spring/fall, CMH/LED SUMMER.

And yeah, I live in Canada, so yes it gets cold. But I heat my house to 72F as hot as I can handle it, and the bloom room is at the same level, if not less. Corner room, facing the northside.

I always thought HPS was so wasteful, now I appreciate them. Spent 3 months vegging these LGBS, now the whole crop is wasted in a matter of weeks. first 2 weeks it was hard to tell anything was wrong, then I thought ok slow starter watch them kick in, over week 3 and 4, but no. So harsh

Please someone share some resources on low temp effects on flowering. I would love to flower without my HPS and using space heaters.

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