[Qhave
="WildBill, post: 2371522, member: 48437"]
18 is a bit close unless ya have co2.
This is the PAR map at 19.5in. You better have your VPD spot on with proper feeding and really good watering. Things can get outta hand quickly, especially the smaller the pot. I had mine running at 19-20 in when one girl went on her spurt and she got stressed pretty dang quick. This is a pretty dang intense light.
Just letting ya know what I've seen on my grow. It may not hurt your girls,but now ya know that ya may wanna keep a close eye at that level.
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I have the Ts1000 and the info suggests approx 700 micro moles in the centre of a 2ft square, and 400 round the sides (@18in). I have a 2 1/2 ft square tent and my babies on the outside are doing fine. Here's a pic when I put my light in at 16in - but look what I've had to do to get 18in (ideal), the FB Zkittlez has gone mental and is clearly enjoying being very close to the lamp, the SS Purple Amnesia is still developing nicely at 18in away and my baby LSD is doing nice at 18in but in a corner.
It seems I can put any plant at any stage anywhere under this light. I'm staying at 18in as it seems it has no problems delivering the light to plants of different stages - perpetual auto grow with 20day planting interval. I love this light instead of getting bigger lamps for larger spaces I may use a Ts1000 for every 2foot square.