The Q&A Archives: Wattage requirement for grow light or flourescent lights

Question: How high of a wattage should the light be after seeds have sprouted? I have a 125 watt

Answer: Your plants need good strong direct light. The plants' leaves need to be quite close to the bulb, within just a few inches. (Raise the light as the plants grow taller.) The longer fluorescent bulb will probably work better if you have more than one plant. If you have a lot of plants, 24 inches with a single bulb is probably not going to light up a large enough area.

For seedlings like this that are only grown indoors temporarily, ordinary fluorescent bulbs are fine; in a shoplight hood (holding two bulbs) you might use one warm bulb and one cool bulb if you want to extend the spectrum a little bit but ordinary bulbs are fine. To give you an idea of how much space, you can fit two flats lengthwise under a single four foot shoplight hood. The number of plants per flat depends on what size container you use for each plant.

I hope this helps.

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