E40 metal halogen steam bulb hpi plus 645667 bubu p philipsthe hpi plus bulb is a metal halogen bulb with an ellipsoidal coated external bulb for the professional lighting of high rooms like industrial halls shopping centres train stations or airports through the 60 higher light current compared to hpl bulbs and a high average lifespan of up to 20 000 hours very low maintenance costs are caused during operation light bulbs with the bu p protected design may also be used in open l