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.
This cover is for your dishwasher's water softener. If you cap has broken, the water softener will cease functioning properly. Fortunately, this part is replaceable and will have your appliance operating like new again.