Halogen Infrared 2 kW 352mm SK15 Heater Lamp Bulb. 2000 Watt 2kW Ruby SK15 heater bulb. Fits infrared heaters that use 2 kW SK15 350 - 355 mm bulbs. The ends of these 2kW SK15 heater bulb leads have 1 cm of exposed wire which can be increased and the ends can be shaped into a spade or loop or whatever is required.