too cold during dark hours

[Claude Hopper]

PM can be a real problem.

That said, years ago I let some little plants grow in an unheated upstairs room with just a southern window for heat. It was 30-40 F some nights yet the little plants grew (slowly) and produced some viable and valuable old school Columbian seeds

 

[Devilman]

Another possible long-term alternative, is rather than dropping more power on heating etc.. could be to get rid of that 1k setup and replace it with a pair of 600's and divide the closet in two...

You could then flip them 12hr apart and let one keep the other warm, with less total power usage than a 1k + small heater... Could even allow you to stagger them 4 weeks part so your taking half-crops twice as often..

Something worth considering imo, why waste electricity creating heat, when we could be creating light and using the by-product heat anyway?

 

[trailblazer2]

I totally like the idea of two lights on alternating light schedules. im very handy at designing and building grow cabinets so looking forward to that challenge. take a look at my post in the growing_soil forum: rootbound 3 weeks into bloom. it has other details about this grow.

 

[ProvisionSeeds]

You can split up your room into two and have two small fans that that blow into the other room controled by a timer. So when the lights on one side turns on you will have an exhaust fan blowing to the side that's asleep.