The bulkhead is surface mounted, once installed, it emits a bright 340 lumens of cool white 4000K light, with a wide 100 beam angle, ideal for most general lighting purposes.The bulkhead is constructed from a tough polycarbonate, with a smart black finish and opal diffuser to soften the light. It has an impressive IK10 impact rating and IP66 rating, so is suitable for use outdoors and in busy areas. A built-in safety isolating control gear protects the luminaire from short circuits.Please note, this light is not suitable for dimming.IP66 rated. Instant full light.