The Glass is an OEM replacement part for Samsung over-the-range microwaves. This tempered glass cover protects the interior light source that illuminates the cooktop below.  Symptoms of a bad lamp glass include: Dim or no light emitted from the cooktop lamp Cracks, chips, or other optical damage impairing clarity Improper seating or instability of the lamp glass panel Causes of failure can be impact fractures over time, thermal damage from heat exposure, or issues inhibiting appropriate illumination.DE67-40063A (AP4226724) replaces 2083136, PS4231970.