400w MH

A 400w Metal Halide, can be used in 1m x 1m x 2m grow tent. Usually when plants are in late veg.

MH bulbs gives off light in the blue spectrum. The wattage can differ from 250w, up to 1000w. Bigger bulbs will be used in bigger grow rooms.

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These lights are in the HID category, and will use up a lot of electricity, and produce a excess heat. So it is important to ensure you have suitable extraction., when using this kind of grow lighting.

If you have questions, and you need answers quickly, sign up to our cannabis growers forum. There you will find a Q & A Section, where you can ask anything you like about growing cannabis. We have many experienced cannabis growers in our forum, and you will get an answer to your question quickly!