Another environmental factor you've got to watch when growing vegetables under lights is temperature. Fluorescent lights don't generate much heat, but even they produce enough to take into account; incandescent bulbs, of course, give off a lot of heat for their size. Cool-season vegetables such as lettuce like temperatures that don't rise much above 65 degrees Fahrenheit. Warm-season vegetables such as tomatoes grow and mature best when the temperature is above 65° and below 90° F. And this is during the day. Night temperature should be 50 to 60 degrees for leafy and root vegetables, a little higher for the warm-season varieties.

Raising lettuce and tomatoes side by side is therefore involves quite a bit of juggling, even though you probably want both for salads. You can try placing cool-season vegetables at one end of the table, warm-

season vegetables at the other end, varying the temperature along the table by such trickery as putting a heat-producing incandescent bulb at the warm-season end to beef up the fluorescent bulbs.

If your temperature is unsatisfactory and the air is stagnant around your indoor light garden, investigate the possibility of installing a small fan or other device to improve the ventilation.

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  • Holfast Sackville
    What temperature be in veg with lights off?
    7 years ago

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