The Jump Start JST54, 4 ft. T5 Light Fixture is perfect for starting seedlings and rooting cuttings. Cool running design allows light to be closer for healthier, hardier plants. Included T5 bulb is over 2 times more efficient than ordinary fluorescent lights. When germinating seeds, the fixture can be kept just inches away from the seeds or dome. After sprouting, keep the fixture 3 to 6 inches away from the tops of the plants.