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I grew a 4x4 hydroponic garden in Seattle growing cherry tomatoes under a 400w hps bulb. It was awesome had a bumper crop until some of the tomatoes fell to the ground and I had a crazy fruit fly infestation. Good times

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How much does it cost monthly to run that 400w light?

Did you have any issues with fruit flies in general or only when the tomatoes fell?

Once the fruit ripens then you start to have problems. Cherry tomatoes were problematic in general besides there were too many and they fall off and stuff. I also wasn’t as careful as I should have been pruning so that created pockets for Things to fall into. Honestly if you have a balcony with good exposure just build an earthtainer or 2 it’s a lot easier and grows fine in Seattle.

Also hallide lamps are amazing during SAD season just make sure your lease does not specify max light bulb wattage

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