Concerning the lamp(s) inside this product and spare part lamps sold separately:
These lamps are intended to withstand extreme physical conditions in household appliances, such as temperature, vibration, humidity, or are intended to signal information about the operational status of the appliance. They are not intended to be used in other applications and are not suitable for household room illumination.
Ensure no air can escape your tumble dryer by having all the drum seals secured and in-tact. This seal is the rear drum seal and is an ideal replacement if you've noticed yours is wearing down, or has split.