Eurostar Reflekto MR11 GU4 base halogen lamps provide professional accent lighting without back-spill. MR11 Reflekto is offered in Black or Silver with no light diffusion from back-spill. Reduced heat to socket, fixture and transformers. 80 percent reduction of IR to the back of the lamp. Axial filament for precise beam control. Available in 20 watt and 35 watt with 12 degree beam angle. 2900K color temperature. 1500 hour average lamp life. 1.38 inch diameter x 1.61 inch length.