I am currently running 4 Hlg qb 120 with the 240-2100ma driver. I want to add a Hlg qb 18 for ed supplement. my ? is would the qb 18 be mounted evenly with the qb 120 or do I mount the qb 18 closer to the plants. Thank you all for your response. I must note that I am currently running 3 120’s on the 240-2100ma. Stats for qb 18 at 4 boards require the same driver. 
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I would mount at same height. So you’re going to remove 4th 120 board to install a qb 18? What size grow space?
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@dbrn32, 2 x3 grow space, with highly reflective mylar…I bought an LPC driver for 1 120 board and I am using it to veg in a 2x2 space with reflective mylar. …Thank you Db…
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@dbrn32, you think 2 120 and 1 qb18 is enough for a 3x2 flower room and 2 120 for a 2x2 vege room. Thanks for your input.
No. Stay with the single board to veg the 2x2, just don’t run less than 18 hour light schedule.
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I have (2) 600w Bloomspect full spectrums in one tent that is on a 24/7 cycle ( 4 sour diesel autos that are 6 weeks into flowering) and (1) Giixer 1000w Dual chip full spectrum in my other tent that is on12/12 right now. My question would be should I run the Giixer on both channels or just the red? In that tent I have 2 Black Domina plants that are 1 week into flowering. With both sets of the lights running it does heat up the room a good bit
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Makes sense to run this light at full power
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