These MR-11, MR-16 and GU10LED bulbs are designed to replace halogen light bulbs. Compared with 500~2000 hour average life for halogen bulbs, these LED bulbs last 50 times longer. That translates into enormous savings on light bulb purchase price alone! Buy once, install them and forget about them! Never need maintenance again. Very little heat generated. These bulbs are about 10X more efficient in converting electricity into light, so a 2W LED bulb is almost as bright as a 20W halogen bulb. Flicker free and no hazardous gas inside the bulb! These bulbs might not work in some halogen lighting because the electronic ballasts in some halogen lamps think the wattage of these bulbs are way too low. If your halogen lamp requires a minimum wattage, these bulbs might not work. You are welcome to buy one LED bulb to test it and if it doesn't work in your light, send it back and we will refund it.