emergency lights ykdtronics 5w backup led light bulbs with rechargeable battery for daily use, power outage, camping, hurricane, disaster planning, 500lumens 40w equivalent daylight white 5000k 2pack ykdtronics ykdtronicsemergency backup led bulbs are so amazing that you can do so much with them! they look and work like typical led light bulbs but they are far from typical. they are ready to light up during power outages. <br/><br/>specifications<br/><br/> brightness: with household 120v ac: 500 lumens<br/> light color: 5000k daylightwhite <br/> run time without power: more than 3-4 hours after fully charged<br/>wattage : 5 watt <br/> input: ac 120v <br/><br/>applications<br/><br/> home, office, basement, garage, warehouse, workshop, garden, porch, patio. <br/> camping, exploration, hiking, work light. <br/> emergency backup during power failure, hurricane, flooding, earthquakes, disaster planning toolkit, evacuation planning. <br/> use as magic trick bulbs, party bulbs.<br/><br/>question: how to use these bulbs?<br/> answer :replace your old bulbs with this new bulb in your lamp and use it as a regular bulb, it will work normally when there is no power outage, and it will continue to work for 3-4 hours when there is a power outage; you can also screw the bulb into our bulb cap (with a hook) and light it up with the on/off switch built in the cap, this way you can move the bulb around wherever it is needed; or you can use your fingers/damp cloth/conductive materials to touch both the tip and the threads of the bulb base to light it up. <br/>question:<br/> how does it work during outages? <br/> answer :during power outages, as long as the light switch is on, the light bulb in the socket will stay on for more than 3-4 hours. tip: to test the bulb even without a power failure, simply place the bulb in a lamp socket, and turn on the switch of the lamp, plug out, use a wet cloth or wet tissue connect the prongs of the plug, bulb will turn on.<br/>question: why the bulbs won’t turn off?<br/> answer :a small fractions of household’s circuit designs are not “typical” and the bulbs will stay on even when switch is off.