I'm wanting to grow orchids indoors. I can control temp and humidity but all the research I've done recommends flourescent and incandescent tubes as lighting. The issue is the recommended wattage only comes in 4ft long tubes, and the area I'll be growing them in is only about 2x3feet. I'm wanting to use a 70watt metal halide and was wondering if this is at all possible. If not what are my other options?