If you can get the temperature up to around 65F days and 45F at night
they will do ok. My trouble lights were 75W max, so one incandescent
bulb was their limit. (I did not want to risk melting the vinyl coating on
the racks, catching the paint or vinyl shell on fire, etc, by using infrared
heat lamps.) The outside seedlings had the cold weather purples (cold
temperature induced intereference with phosphorous uptake) until
mid-April.
It was a fairly cold spring and early summer in 2011, and seedlings
outside in unheated greenhouses were suffering more than most
years as a result. Any year can be like that, even if most are not,
so having more heat available to the seedlings just in case, especially
in March to early April, is a wise precaution.
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