Tikva, I'm new to orchid growing but I've used artificial lights extensively with other non-orchid plants. I have had success with fluorescents, they are easy to find and easy to set up. I've strung together 6 - 8 4" 40 watts for light the winter (from when I was living in Chgo) and by spring the plants were very well along and ready for the window sill. Fluorescents stay cool so no worries about fires when you're out of the house and the lights can sit right on the plants for maximum lumen coverage. The HID lights run about $250 more or less and need ventilation because they get hot, but provides much more usable light for the plant. You'll have to watch the temps, get some air circ going and control the humidity, e.g. add some b/c the light depending on your space will make the grow room hot. So fluorescents if you're on a budget and HID if you want a serious light that is more efficient. I prefer fluorescents because they are light and easy and I'm kinda no maintenance myself.These are shop light type fluorescent not special grow bulbs, which I think are a rip off. Incandenscent just is not going to work, by the way.
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