Still, there's only three major types of artificial light you're going to see:

- Incadescents. The kind you're talking about. The coating doesn't matter; it's the way light is designed. That light uses roughly 80%-95% of it's electricity as heat, not as light. They are terrible for growing.

- Flourescents. Either the long tubes, or the replacement style for screw in incadescents, in which they generally look like a bunch of twisted glass. These are far more efficient than incadescents, are pretty cheap, and while far from the best method of lighting your plants, are miles beyond incadescents.

- HID. Either HPS (high pressure sodium) or MH (metal haldide). These are the best methods to use for indoor planting, period. Incredibly efficient, they give off the perfect spectrum for plants, and the vast majority of electricity used goes into light, not heat. Although, because of their extremely high power systems, they generate a lot of heat themselves. These are also generally more expensive than floros.

And last, but the best, if you can have it indoors for more than 12 hours a day...


Direct sunlight.