Cover the trays with clear plastic to maintain soil moisture and humidity until germination occurs. Check them daily and gradually remove the plastic cover once the seeds have germinated. Unless you have a greenhouse, fluorescent lighting is recommended. Incandescent bulbs produce red light, which when used alone, tends to produce leggy plants. The bulbs also produces a lot of heat in comparison to the amount of light given off.
Fluorescent tubes come close to duplicating the color spectrum of sunlight.
Plants produced under them are usually green and stocky. Cool white and warm White fluorescent tubes, used together, produce the best light for plant growth. Cool white emits light in the blue wavelength while warm white emits light in the red range. Most cool white and warm white tubes will last 18 months if operated 12 hours daily. Light toward the end of the tubes is weaker than light in the centre, and falls off even more as the tube ages.