Richard

The twinkle kind are LED's and won't provide heat. You need the C7 lights if you want warmth. Further, the best they can do is raise temperatures in the low 30's to the upper 30's (F). They will not provide protection against a freeze. Do not put them closer than six inches to the plant stalk or leafs -- a hour of close exposure will cause damage to the plant. You'll also need to put some cheap plastic sheeting material around the lights and plant to hold the warmer air in. Check out the plastic sheeting sold for drop cloth at a paint store or department.

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