I was hoping to start an indoor garden this winter. Turns out I already have a fluorescent light lying around the house, the 18 inch type, 15W warm white. Would that be sufficient wattage or should I get a new light?
Fluorescent Light for Indoor Gardening
Certified GKH Gardening Expert
That should be strong enough, but depending on the type of plants you plan on growing, the bulbs may need to be closer to the plants. Low light plants do not need to be as close, and high light plants would need the lights very close. Here is an article to help: https://www.gardeningknowhow.com/houseplants/hpgen/fluorescent-lighting-for-indoor-gardening.htm