According to EESL, an incandescent bulb requires 60 watts of power to emit 350-400 lumen of light (unit of light) while CFLs with its hazardous mercury coat emit 450-550 lumen of light on 14-16 watts. In sharp contrast, LEDs cast 600-700 lumen, consuming just 6 watts of power and saving 90% more energy than regular bulbs. LED bulbs also have a life of 15,000−20,000 hours.