Planetarium Lighting

Does anyone have a creative and relatively cheap solution for lighting under the dome so we can use the space for class work? We'd like to have enough light for reading, doing lab experiments, activities, etc...about 40 foot candles. We have looked into the RGBW systems but have heard that they don't really provide enough light for traditional class work. True? Besides, we aren't installing the traditional cove lighting system for quite sometime but will need to use the room for class work as soon as the dome is installed. Thanks mucho. Jason