Plants' lower leaves are turning yellow. Normal or sign of trouble?

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Originally Posted by chenman07

Oh and one random questions regarding hps stinky. I know this is for plant problems and not lighting but would I be able to get away with purchasing a reflector without holes for ventilation?

I know it is better to have dedicated ventilation but it seems any reflectors that are cooling capable are much more expensive($50 more between the two systems i am thinking about) not to mention an actual inline fan costs quite a bit more than i expected.

Could i just have a fan blowing air up into the fixture to cool it?

I am looking at DIGITAL 600 watt HPS GROW LIGHT 600w SODIUM w BALLAST - eBay (item 180175343454 end time Jul-27-08 10:44:24 PDT) in case you wanted to get an idea of what I am considering.

Opinions before i purchase it for my babies?

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K first off, how many plants are you going to be flowering? I saw like 5 in the pic? 600 watts is MORE than enough for 5 plants. What size space are you working with? You will DEFINATELY need a blower fan with ventilated reflector for 600W or really any HPS over 250W I would say. A fan blowing air up into the reflector is not the same as the blower fan because the blower fan is actually sucking air out of the room which will in turn suck new air in from wherever it can (or wherever the intake you have setup is). I know this is a pain in the ass to construct but it is necessary for heat control and just fresh air (which will contain CO2 necessary for growth). And don't even get me started on supplementary CO2 schedules haha. Good luck. Any questions? :rasta:

I took your advice while improving my grow room. Day 4 of 12/12.

Your plants do look great!! All normal.... could be due to shade... or if you have sprayed liquid fertz on the plant directly... but i would have cut the lower branches before flowering... but i bet u get a qp or more outta all that maybe a whole one... depends on how good of seed u got and how well you babied them. But A++ Looks like a pro did it!:thumbsup: