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I picked this up from a ad on craigslist. I was told that it was a 1000 watt ballast, but I am unsure. Can anyone tell me how I could get a definitive answer? The sticker on the outside lists 1000 - 400 watt.

I know that my plants are having a little issue with heat. 3 of my tallest plants show curled edges, but 2 of the plants are showing this. Is this a result of nutrient burn, or is just a symptom of being burnt? Any input would be helpful. Thanks,