The light lens (diffuser) protects the bulb and reflector from water and dirt and shapes the light beam.
Replace it if it is cracked, chipped, or fogs up because the seal has failed. Check the shape and diameter against the model name. Not sure the part will fit? Call the store and we will help you choose one for your model. If you have the old part, compare its dimensions and mounts with the new one before installing.
