Philips Master HPI Plus BU, BUP, BUS and BUSP Elliptical Quartz Metal Halide Lamps are available in 250 Watt and 400 Watt coated. They offer excellent colour rendering CRI Ra. Some of these can be used in open fittings and some are restricted to closed fittings use only. Please take care when selecting for open fittings to ensure the lamp is designed for this. Many metal halide lamps are interchangeable but not all. If you are seeking a cheaper alternative to replace your existing lamp, please call us and we will be able to advise you on a compatible product.