To better utilize space during the propagation stage, light carts are sometimes used. Light carts make it possible to stack several trays of seedlings in a very small space. Most light carts use fluorescent grow lamps instead of HID's. Many fluorescent "grow lamps" have a balanced color spectrum, closely approximating natural sunlight, but their low lumen output make them impractical for growing plants with high light requirements.

Fluorescent lighting is excellent for rooting cuttings, since tender young cuttings and seedlings do not need as much intense light as more mature plants. Even so, the lamps should be kept as close to the young plants as possible, preferably within a few inches.

Wide spectrum fluorescent lights are recommended, cool white fluorescent bulbs can also be used if necessary. Their strong blue light is good for initial growth, but their lack of illumination, particularly in the red part of the spectrum, slows down root development by a few days.

For gardeners on a budget, using a fixture with one standard fluorescent bulb and one wide spectrum fluorescent bulb may be a good compromise.

Back to the Hydroponics FAQ.