T&F1 336 TCR Recess Air Return Louver Luminaire 3x36w Housing High quality cold-rolled steel sheet Reflector 99.85% high purity anodized aluminium reflector mirror finished (DIN 5036-2) for normal usage. Diffuser Spring-lock type farme for ease of maintenance Lamp Holder Heavy duty rotary-locked type (G5) lamp holder (TIS.344-1987 Standard) IP Rating IP20