Roper B400 Use And Care Manual page 20

REPLACING THE OVEN LIGHT (some models)
Do not touch hot oven bulb. Do not touch bulb wlth wet
hands. Never wipe oven light area wlth wet cloth.
Never touch the electrically live metal collar on the bulb
when replacing it.
Electrtcal power must be shut off If you have to replace a
broken bulb.
Replace the bulb with a 40 watt, appliance bulb. An
appliance bulb is smaller than a standard 40 watt house-
hold bulb and is made to withstand high oven tempera-
tures and have a much longer bulb life.