As long as u have ur fan between ur plants and ur light.u should be able to use the 30 second hand rule. worked a treat for me using hps.lower ur hps and to find then sweet spot and make sure aint gna burn ur ladies.so as i say lower ur hps and hold ur hand flat directly above the top leafs of ur plant.count to 30.if aint burning ur hand all is good.if does burn ur hand raise slightly.and make sure the fan is moved.and ur girls will really enjoy ur hps.hope this helps.happy growing;)
 
I'm not liking the 150w HPS...Sour Livers stretched and fell over...Had to prop her up..
Need an LED makeover ASAP...
:doh:
Lol my 3 leaf livers did the same thing. I had it about 40" from the single cob and it just went over. I was surprised it was off the soil but it was nearly horizontal.
 
Day 10...Still under the 150w HPS...With more testing to come...Big thanks to @gbd

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