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Posted: 2/28/2008 9:40:55 AM EDT
| Anyone else had this problem? If so, is there an easy fix, or do I have to send it to Surefire? |
send it back
Did you replace the batteries recently? Remove them and put them in the other way around. The same thing happened to me and this is what Surefire told me to do. It worked!! Never had the problem again. |
I had the same problem. The light worked but the LED's wouldn't. Rotated the batteries. Works great!! |
LED's are Light Emitting Diodes. The most common function of a diode is to allow an electric current to flow in one direction (called the forward biased condition) and to block it in the opposite direction (the reverse biased condition). LED's are semiconductor diodes that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-n junction. Therefore LEDs have usually only work with the batteries inserted 'the right way'. In fact it is possible to harm or kill LEDs by attempting to power them 'the wrong way'. SureFire use electrical and mechanical 'reverse polarity' safe-guards to prevent this from happening (although not all manufacturers do). It is not usually efficient to build-in electronics to allow the batteries to be inserted either way as this wastes energy and physical volume. An incandescent lamp contains a filament that generates heat (and some light) by electric current flowing through it. It does not usually matter which direction the current flows. The lamp and its filament do not have a 'bias' like LEDs do. Al |
Yeah, what he said 
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