... is over 8 times higher than efficiency of incandescent bulbs.1W LED=3W CFL(energy saving light)=15W Incandescent / Halogen lamp3W ... , mercury, argon, xenon or krypton gases. Fluorescent bulb contains mercury.4. Small size LED is very small, so it’s very flexible ... , blue, green are all available. (2). Base type including: MR11,MR16,GU10, ,JDRE14,JDRE27, E14, ,PAR20,PAR30,PAR38,GX53,G4,G9 ...