E40 metal halide lamp hpi plus 645667 bubu p philips the hpi plus lamp is a metal halide lamp with an ellipsoidal coated external bulb for the professional lighting of high rooms such as industrial halls shopping centres train stations or airports thanks to the 60 higher light output compared to hpl bulbs and a high average lifespan of up to 20 000 hours the lamp has very low maintenance costs bu p protected lamps can also be used in open lights all oth