MR16 LED bulbs were designed for retrofit to existing halogen lighting units. As such they are a compromised LED design.
Halogen bulbs also failed at regular intervals - the fact that LED don't last the promised 20 years (or whatever) is not a good reason to reject them.
Incandescent and halogen bulbs are like VHS cassettes and floppy discs - largely obselete bits of old tech which for very good reasons should be consigned to the great scrap heap in the sky (or recycled!).
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