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It was a space thing really. I wanted to get more light further down without pruning them to the bone. Not gonna pop so many next time. I was covering all bases assuming I'd lose a few.

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Would 2 lights at 600 give you the coverage you need? It would pull more watts but probably be more efficient than 4 at 250
 
I personally think less light is worse for yeild than heat. How big an area are you covering? Would 2 lights at 600 cover it and maybe be about the same heat as 4 250's
I've spread em out so I'm now covering most of a 2x2 m area. I can squash em back up I guess... But they were pretty cramped. Live n learn. Next time I'll run half as many girls.

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No. They're upstairs so not ideal to start with from a heat/ventilation point of view. I've got windows open but weather is really warm and close even at night.

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If your intake is in the same room as your exhaust you're fighting a losing battle with heat..your tent will never be cooler than your intake air
 
Hps. Digi adjustable. So I can go 250w up to 600w. I added two lights and put all four down to 250w. Added an extra extractor. Still too hot. Wonder if I can find some cool tubes on eBay... aaarrgh... so heat is gonna be more damaging? Than lack of light? I can switch lights off in relay maybe?

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Too high temps can ruin your crop while too little light will give you airy buds with a low potency.

Thanks man. I'm thinking as a summer emergency measure to get em through to finish. Four lights. Put em onto 18 hours. With 6 hours off. But one after the other. So only three lights lit at any time. If I can push lights up to 400 or 600 after I've staggered switch off times I'll do it. I can go grab four timers today. Also have another fan to add. So get some more air movement too. Sounds like a plan. A half assed plan but a plan! I'll check out cool tubes on eBay. Although probably wrong time of year to find any bargains!

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Sounds like reasonable steps towards easing your heat problem!
I don`t see a grow journal in your signature, do you have anywhere we can follow your progress?
 
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