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Point taken and considered. But I didn't put a 650w light in a 3x3 to save money. The growth graphs level out but not flat without extra CO2. For me, it's worth the approx. $12/month in flower for the extra 300w. It only runs at full power for 2 months a grow, twice a year, three at most. I...

Maybe not "verry" happy but happy enough. These plants are working HARD, there will be stress. There were some issues early on because they had a tough beginning until my tent was empty. The have only been in a good environment 2 weeks. And I'm still fighting a bit of stress but compared to...

Here's a little more detail on my HLG 650R in a 3x3 tent: For veg until 2 wks before 12/12, I run at 28-29° C and 60% humidity. Humidity goes to about 55% prior to 12/12 but is measured with the probe slightly within the top leaves. You want to monitor what the plant is feeling. Probes not in...

I'm a bit late to the party but thought it might help someone else. There's some very knowledgeable people commenting before me. I'm running a HLG 650R in a 3x3 tent and have been fighting calcium def problems for 3 years. I thought it was because my fertilizer had too much ammoniacal nitrogen...

I know this is an old thread but here's a question: wouldn't it be worthwhile to get your pH right (ascorbic acid?) just after adding the brew ingredients and gently mixing? I haven't checked if pH changes during brewing (anyone?) but if it doesn't, wouldn't the microbes produced have a better...

Edit: I should mention that I just borrowed a CO2 meter from our library and the reading in the tent was 1000-1160 ppm so that will definitely help the plants use much higher levels of light. Now I have to deal with the high levels in our living space. Starting to investigate whole home...

This a very powerful light and increasing light needs to happen in very small increments, especially for seedlings. For me, a kilowatt meter is essential. On my 650R, what I thought was the 50% detent on the adjustment knob is actually over 500 watts from the wall while full power is 630 watts...