2 or 3 years life time
Strengths: White light with maximum strength. Dimming control. Flexible head.
Weaknesses: Switch knob is not durable (2-3years). Light color changes with dimming. Noise and heat. Expensive.
Summary: I had two units (2002). Both had switch knob problem. The turn on click mechanically failed, and the light wasn't turned on. One (broke in 2004) could be turned on with tricks, that would take from 1 second to 1 minute, or 1 hour sometimes. The other one (broke in 2005) refused to be turned on since it had knob issue.
I had been satisfied with them when they worked. I wasn't diligent enough to pack and send it to fix them. They are too heavy and large.
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