IP65 28W HF Square Emergency Bulkhead with Opal Diffuser & Black Base. ML TPS28BOEMHF. Main Features: Square Poly Bulkhead. Black Casing 28 Watt. HF Emergency Version. Opal-Diffuser. IP65 Rating. 2D 4-pin lamp: 2D28W4P. Dimensions: 250mm square x 90mm depth.