Philips MASTER - LED HPI lamps offer you a simple, fast-payback solution to replace HID alternatives in high-bay applications. MASTER - LED HPI solutions also offer you the energy efficiency and long life benefits of LED lighting and a long service life with retrofit option. The design of the MASTER - LED HPI allows direct retrofit of HID lamps without changing the entire luminaires or the installed ballast. The MASTER - LED HPI lamp is compatible with both 250W and 400W ballasts to maximize the feasibility of such retrofits. The intelligent ignition logic prevents igniter failure and continued ignition, which can lead to overheating and EMI risks. Multiple beam angle options and a high color rendering index improve light distribution in mid- and high-ceiling lighting applications while creating a comfortable, safe and highly productive environment.