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  • Overall Rating: 4
  • Price: 4
  • Quality: 3
  • Ease Of Use: 5
  • Usefulness: 4
Not as described, good enought for the price – MR16 4-LED 360-Lumen 3500K Warm White Light Bulb (12V) Reviews

posted by mat75 on 08/14/2010 Certified Owner

Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week

Pros:
4 leds in a MR16.
Built in bridge rectifier so will work on AC or DC, is imposable to connect backwards.
Surprisely warm.
Good reflector and lenses.
Cons:
Bought 15 of these, all use 3.5W to 3.6W. Pushed the voltage to 15v, in case leds were not full on. Nup, the driver was working and limiting to 3.6W. Takeing into account the bridge rectifier and driver efficency I'd expect the leds are only seeing 3.3W at most. The leds are mounted on a fairly thick alloy disk, which then sits on a very very thin ridge on the shell. The tolarance between the disk and the shell is rubbish. The shell does get warm showing heat is conducting But the disk gets very hot.
Other:
Good shell heat sink, but could have been much better with no effort. Double the ridge width and a slightly wider disk would really have helped heat transfer to the body.
The leds are underdriven, which is probably a con in this case, due to thermal transfer issue. I'll lay money this light is not 360Lumen.
Bottomline:
Maybe i'm pedantic, but thermal transfer should have been better.

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