Onewish1 said:From what I have seen.. red and blue are good for seedlings
depends on the plant. A lot of plants will get more benefit from the blue end of lights wavelength during their vegetative growth stage, but flowering will increase with more of a shift to the red side. Blue for vegetative growth, red for flowering. (Metal halide lights push more blue, high pressure sodium more red, for example)
Another thing to keep in mind with indoor lighting is to keep the lights as close to the plant tops as possible without any burning occurring. This is because VERY little of the usable light reaches or does much for the shaded leaves under the top sets and having the lights higher only causes more of the available wattage to be lost. Using reflectors or surrounding your grow area with a reflective material such as mylar will help redirect lost light towards the plants. Keeping the lights close will also help to prevent overly leggy plants, which is often an indicator that they are seeking light.
