bulb mp100/u/med/ps The MP100/U/MED/PS is a 100-Watt Pulse Start Metal Halide High-Intensity Discharge (HID) light bulb. Breaking down its industrial part number reveals its exact technical specifications: MP: Protected Arc Tube (features a protective quartz shroud allowing it to be safely used in both open and enclosed fixtures).100: 100 Watts of power consumption. U: Universal Burn Position (can be installed and operated horizontally, vertically, or at any angle).MED: Medium E26 Screw Base (the physical size of a standard household light bulb socket, though it requires specialized HID industrial voltage/ballasts).PS: Pulse Start Technology (uses an ignitor for quicker 2-minute warm-ups, improved energy efficiency, and longer life compared to older probe-start bulbs).