Examples of typical Glo-Ray® model numbers and their meanings: GRA - "GR" represents "Glo-Ray" name, "A" means aluminum housing. If there is no "A," the unit includes a stainless steel housing. GRAH - "H" stands for high wattage (more heat). No "H" means standard wattage (standard heat). "L" added to model means the unit includes incandescent lights. "D" added to model means the unit is a dual warmer made of two (2) single units side-by-side with either a 3" or 6" (76 mm or 152 mm) spacing in between each housing. GRN - "N" indicates narrow models only 4" (102 mm) deep. GR2 - the "2" represents the Designer series. HL - represents Glo-Rite® Display Lights. The number following the letter sequence represents the width (length) of the housing in inches. Example: GRAHL-24 is a 24" (610 mm) wide Glo-Ray® Strip Heater with an aluminum housing, a high watt element and incandescent lights.