This light bu is a genuine Bosch part, sold individually. This light bu can be used as a replacement part for a gas range. This part illuminates the inside of the oven so that its interior can be seen while the appliance is in operation. This allows the user to see the interior without opening the door or visually inspecting the oven from the inside.A light bu will often be subject for replacement at some point in the lifespan of a gas range. This will most likely be due to a light bu losing power over time, but damage can also occur that will necessitate replacement, including cracks, chips, and punctures that can shatter a light bu immediately. If this is the case, the light bu should be removed and replaced with this genuine OEM replacement part. The replacement process will require no special tools. Simply screw the light bu into place.This is an OEM part sourced directly from the manufacturer. It is sold individually. This light bu is compatible with the following appliance brands: Bosch and Gaggenau.00166016 (AP2800893) replaces 166016, 423371, AH3439197, EA3439197, PS3439197, PS8697140.