Suitable for use with Sylvania Britespot or GE CMH PAR16 HID lamps. 78 Lumens per Watt allows compliance with the Building Regulations Approved document L2A/B requiring the use of energy efficient luminaires in commercial buildings. High output, energy efficient, compact metal- halide reflector lamp for general lighting. Suitable for display lighting, shops, offices, showrooms, hotels, etc.. Non-dimmable. Electronic control gear not included . Please note: Metal-halide lamps have a warm-up/re-strike time >5minutes. Therefore these should be used in conjunction with other luminaires that will provide sufficient lighting until the metal-halides reach their full brightness.