How To Use Grow Lights

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One of the biggest advantages to indoor gardening is the ability to regulate plant growth by controlling the amount of light they receive. Common grow lights are metal halide, high pressure sodium (HPS), and fluorescent. Each have their own advantages. Metal halide and HPS grow lights are high intensity discharge, so the light they produce is more able to penetrate the plant leaves.

Fluorescent grow lights can grow plants indoors, although they produce smaller plants and are generally considered to be very inferior to metal halide and HPS grow lights. Fluorescent lights are typically used with seedlings or clones because the light produced is gentler on these fragile plants.

Metal halide grow lights are typially used for the vegetative stage of plant growth. Metal halide grow lights produce strong blue and white spectrum light which effectively mimics a summer day. HPS grow lights will produce strong red spectrum light which mimics the angle of the sun during fall. When plants are ready to begin flowering, they should be grown under high pressure sodium grow lights.

Now is the time to use a digital timer to change the grow lights cycle from 24 hours of constant light to 12 hours of light and 12 hours of darkness. This will tell the plants the days are shorter and its time to flower before winter comes.

It is a common myth that plants can't utilize more than 12 hours of light per day. This isn't true. If you never decided to switch your grow lights to 12 hours of darkness your plants would continue to grow until they reached an unmanageable size!

We recommend you start the flowering stage (12 hours light/dark) once your plants reach 10-18 inches in height. During all stages of growth your grow lights reflector should be about 6 inches from the growing tips of the plants. Since the reflector stays cool to the touch there is no risk of your plants burning. As plants grow taller, adjust your grow light reflector.
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Patricia Paxon has 1 articles online


We offer a wide selection of the best grow lights from LED grow lights, fluorescent grow lights, indoor grow lights, Indoor Grow Lights, high pressure sodium (HPS) lights, and more.

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How To Use Grow Lights

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This article was published on 2011/04/19