I don't think your plan will work. Even at 50 degrees they will stretch out, reaching for the window light. A month is a long time. Leaving them unattended under lights probably wouldn't work either though. To allow room for them to grow without hitting the bulbs, you would have to set the lights too high when you leave for your trip. I'm thinking the plants would just stretch out reaching for the lights anyway.
I hope you won't blame the caretaker if you come home to dead or sick-looking plants.
Can you contract with a local greenhouse for a month?
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