Philips Master 4watt LED MR16 light bulbs are ideal for a myriad of applications including track lighting, general architectural & landscape lighting, display case fixtures & cabinet lighting, plus industrial OEM equipment lighting. Ultra Low Energy This 4 watt LED MR16 light bulb replaces 20w halogen MR16, saving you money on energy bills, with out compromising on light quality. Lasting an average of 45, 000 hours, this bulb lasts over 10 times that of a halogen, saving you money on maintenance & replacement bulbs. These savings mean these MR16 light bulbs can deliver a positive return of investment in as little as 12 months.