If you're trying to avoid an infrared signature or noticeable power spike, I'd suggest using fluourescent grow lights. If your grow space is relatively airtight, fluourescent can take a slight edge off of any really chilly space.

However, if you need add'l heating from your grow lighting, just spring for a 400 - 600 watt high pressure sodium lamp...you'll get better yield from the veg stage, and possibly not have to run any heaters during the winter.

Good luck!

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