The light is a full spectrum sun simulator. Our's is Happy Lite brand. Do a search and they will pop up all over the Internet. I purchase mine from Harmony. Had a few troubles getting replacement bulbs once upon a time - they kept sending the wrong size, but we could not live without ours in the bleak, no sunlight days of MN winter.

Actually, that's a little overkill, not quite accurate. It is really sunny in MN all year 'round. There's just not enough daylight hours to fulfill the body's need for natural light. So like a chicken that needs 14 hours to lay, we need 14 hours of light.