General Electric WB08X10057 Microwave Halogen Light Bulb 50-watt While this may seem like a relatively unimportant element, it is quite critical to ensuring that food is cooked thoroughly and without a mess. One of the more overlooked aspects of the appliance is the light that enables you to see the food while the microwave is in action. Microwave halogen lamp is a 120 volt - 20 watt bulb designed to replace burned out microwave bulbs.