I'm attempting to grow Curcubits and Nightshades (for eating) indoors (in the middle of winter). I recently acquired a (Red/Blue LED 120 watt) grow lamp - but my calculations are that it will eat a lot of electricity for the number of seedlings it will produce. [ I'm growing everything in a 60cm x 40cm x 35cm high with my lamp situated about 10cm above the lid ]
Am I better off having this light come on intermittently throughout the day and night to provide warmth and heating, or have it on a timer - say 4 hours per day, and rely on heating from a heat pad (actually a heating blanket under my plastic growing chamber) ?
(Unless it is not practical to avoid it, I would prefer not to leave the light on for 12 hours per day as it seems it will eat quite a lot of power)
I guess a third option would be to remove the heat pad and rely on the Light, but I think this would be inefficient for heating.
Does anyone have any ideas how best to optimise the setup of my "growing container" ?