Direct Replacement LED Longevity

GregROGR Forum Member

Just over a year ago, I purchased a 25 pack of direct replacement LED's from a well-known seller of these bulbs who attends York regularly. They were replacements for the 1445 bayonet bulb and are rated for 18 volts. The problem is that 16 out of 25 bulbs have now failed in just over a year.

I decided to open one up and see what's inside. There are 3 components: bayonet base, 8mm "straw-hat" type LED, and a 300 Ohm resistor.

What's making these bulbs fail? They are installed in lamp posts running at a steady 10 VAC using a postwar ZW. Is it just my bad-luck? Is it a defective lot of bulbs? Is there an inherent problem such as reverse-voltage breakdown, overheating on pulsed AC, or an incorrectly sized resistor?

Has anyone else had similar experiences with direct replacement LED's?

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7/5/2010:09 AM

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