Fading in one of those 10000Lux therapy bright lights

Does anyone know where I can get one of those therapy lights that would be controllable from an arduino in intensity, so I can fade it in/out at a programmed 24 hour schedule that I program?

What kind of light is it? Incandescent? Fluorescent? LED? What's the voltage & wattage?

Do you want to dim it with a knob, or with software and the Arduino?