Posted: 10/25/2011 1:49:53 PM EDT
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http://www.jameco.com/Jameco/PressRoom/emergencylight.html?sp_rid=MTk3NzMxMjc4OTIS1&sp_mid=3726975
Jameco electronics sends out electronics projects every so often. This month's project is a DIY light that uses LEDs and a wall wart charger. 
When the power is on the LEDs are off. When the power goes out, the light comes on. It's a very low current driver circuit so 4 AA batteries should power it for a very long time. It would be a pretty simple change to use NiCd or other rechargable batteries and modify the circuit to charge too. |
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Ikea solar light found here.
Recharging time is 9-12 hours in sunlight, but over 12 hours on a cloudy day. When the battery is fully charged, the product will light at full power for aprox. 3 hours. Includes 3 rechargeable batteries (AA 1.2V) that stores energy from the sun. The batteries can be replaced and last a minimum of 2 years. Built-in LED light bulb. LED life time approx. 20,000 hours. Light colour; warm white (2700 Kelvin). 
I have two of these and the only thing that I wish was that you had the option for it to charge if off the wall outlet. |