Home Depot sells compact flourescent bulbs that have a color temperature of 5500K or 6500K, forgot exactly which. That is the correct color temperature for taking pictures. I use three of them, each equivalent to a 60 watt bulb in terms of lumens. I have found that the pictures are better if I turn them on about 5 minutes before I take pictures. I also use a standard photographic "gray card" that reflects 18% of the light that hits it. I put it in the light box with the lights on, set the camera to aperture priority, set the aperture to f8 and, making sure the gray card fills the viewfinder, I depress the shutter release about halfway until it tells me what the shutter speed is. I then switch the camera to manual and set the shutter speed(aperture is already set) and take a photo. If it looks a bit light, I increase the shutter speed, and if it looks a bit dark I decrease it. Usually, it is just about perfect.