TaoTronics Elune Dimmable LED Desk Lamp (Piano White, 4 Lighting Modes: Reading/Studying/Relaxation/Bedtime, 5-Level Dimmer, Touch-Sensitive Control Panel, 1-Hour Auto Timer, 5V/1A USB Charging Port)

Technical Specification:

  • Type TT-DL02
  • Color White
  • Opearate Voltage DC 12V / 1.5A
  • USB Voltage 5V/ 1A
  • Size 18.8 x 7 x 2.5 inches
  • Power 14W
  • Lumens 530lm

Download :

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•TT-DL01/TT-DL02 English/ French/German User Manual

TaoTronics TT-DL01, TT-DL02 User manual.pdf  

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•User Manual for TT-DL02

78-84700-001(002)(011)(012)(101)(102) User Manual.pdf  

FAQ

Lumens: 530 lm Source: http://www.taotronics.com/taotronics-elune-tt-dl01-black-desk-lamp.html
The USB port is meant for charging other devices (aka, plug a phone charger into the lamp). As far as I know, it serves only as a power out, not in. Also, the lamp doesn't run on batteries and needs to be plugged into an outlet. Hope that helps :)
According to the label on the lamp, its life span is 40,000 hrs, that gives you about 4.5 years if you leave it on 24/7. So...no, you don't need to replace the bulb, you just have to get a new lamp after 40k hrs.
My still fairly brief experience is the same as the other respondents, I.e. I haven't had this problem or any others so far.