TaoTronics LED Desk Lamp ( With 3 Lighting Modes, 5 Dimmable Levels, Intelligent Memory Function, Convenient USB Charging Port, and Original and Innovative Design) - Black

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•User Manual for TT-DL21

TT-DL21_User Manual.pdf  

FAQ

An LED lamp is a light-emitting diode (LED) product which is assembled into a lamp (or light bulb) for use in lighting fixtures According to the claims from various manufacturers LED lighting has a life expectancy of 20,000 to 50,000 hours. At 8 hours per day this would be approximately 17 years. This is roughly 30 times longer than incandescent bulbs and 5 times longer than compact fluorescents. Taken from: http://www.ledbenchmark.com/faq/life-expectancy.html. I'm not sure about changing the LED's in the lamp but you might be able to.
Yes, it does! I bought 2 of them and absolutely love them. Hope this helps 
If you are concerned about electrical power consumption of LED lights you probably should go back to candles. But candles drip and flicker too much. 10 watts max according to the owners manual.
The Power adapter that comes with it says "Input voltage : 100 - 240V". So yes, I beleive it works on 220V. However, the power adapter has a UK plug so you will need to make sure that you can use that in the country that you are in. Hope that helps.
Sorry that I don't know the Answer. I seldom us the USB charger and threw out the "booK" almost immediately. I "think" it in the moderate range from my limited use. - It is a - for me - a GREAT desk lamp .