21 SMD 4.4W PAR20 LED light bulb E26 base 300 lumens replace 40W incandescent downlight BLUE color hydroponic grow light 300 lumens total light output. Similar to a 40W incandescent light bulb E26 medium screw base fits common US household light bulb sockets 50000 hour life, last 35 years for average 4 hour per day usage. Last 20 times longer than regular incandescent light bulb. You may never need to replace it in your lifetime Only use 4.4W electricity. twice as efficient as CFLs. Instant on. Contains no mercury Works from 110V AC(standard USA voltage) to 240V AC. Might not work with dimmers.