Related by context. Frequent words. (Click for all words.) 77 incandescent bulbs 71 CFLs 67 compact fluorescent bulbs 66 CFL bulbs 64 fluorescent bulbs 64 bulb 64 light bulb 63 incandescent light 63 LED bulbs 61 light bulbs 60 bulbs 59 lightbulbs 59 lightbulb 57 incandescent 55 LEDs 55 LED lights 53 fluorescent lighting 52 watt 50 ENERGY STAR qualified 50 halogen 48 watts 48 LED lighting 47 OLEDs 47 cathode ray tube 47 kWh 47 light emitting diodes 46 inverter 46 lamp 46 kilowatt hours 45 fluorescent lights 45 fossil fuels 44 lithium batteries 44 CRTs 44 kilowatt hour 44 light emitting diode 44 compact fluorescent light 43 lumens 43 acid batteries 43 lamps 43 LED 43 LED backlight 42 fossil fuel 42 light emitting diode LED 42 internal combustion engine 42 photovoltaics 42 lighting fixtures 42 ENERGY STAR 42 photovoltaic cells 42 wood stoves 42 kwh 42 water heater 41 solar cells 41 solar panels 41 BTUs 41 batteries 41 electricity 41 rechargeable batteries 41 Lighting Science 41 filament 40 OLED 40 ENERGY STAR ® 40 kilowatt 40 reusable bags 40 lithium ion batteries 40 kilowatts 40 luminaires 40 diodes 39 LCDs 39 Lithium ion batteries 39 Osram 39 stoves 39 refrigerants 39 transistor 39 candle 39 AA batteries 39 rechargeable battery 39 refrigerant 39 Earth Hour 39 lithium battery 39 photovoltaic panels 38 internal combustion engines 38 therms 38 reusable shopping 38 renewable 38 renewable energy 38 capacitors 38 clothes dryer 38 PV modules 38 inverters 38 backlight 38 appliance 38 streetlight 37 air conditioner 37 HFCs 37 LED backlighting 37 cleaner burning 37 CFCs 37 RoHS 37 solar 37 CIGS 37 mW