Review (4/5): It has awesome magnification! It is worth the money
My Wife loves this mirror! She loves it's looks and functionality! It has awesome magnification! It is worth the money! My only knock on it is the length of time the LED is useful, having a limited time span! The manufacturer informs that after 7 to 10 hours of use, at approximately 15 minute intervals, the LED brightness diminishes to 80%! I did further research on LED and discovered that it is indeed the case that LED lose their luminosity over time.
Here is a brief explanation:
"The most common cause of failure for high-brightness LEDs is dimming over an extended period to the point that the light is no longer sufficient for its intended purpose. The primary cause of this loss of output is a reduction in quantum efficiency as dislocations in the chip’s crystal structure increase adding to the number of sites where non-radiative recombination can occur.
LED chipmakers are working hard to reduce the number of defects in the devices when new, but semiconductor manufacturing processes are not perfect and there will always some faults. The most important factor under the control of the design engineer that does influence longevity is junction temperature. Operating the LED according to the manufacturer’s thermal guidelines will reduce the rate of crystal degradation and ensure a long and bright operating life."
In other words, to increase the lifespan of the LED, avoid long periods with the LED energized! I would only turn on the LED, when necessary and for short periods at a time. i.e. 5 to 10 mins.
All things considered, it is a nice mirror!!!