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For bulbs that are really cheap, people won't keep their receipts and warranty information. I think it will be hard for bulbs to differentiate by warranty.

If you buy at Costco, you can return them at any time in the future without a receipt. The return desk will lookup past purchases using your membership card.

yea if it fails after a year (vs. a few days) very few people are going to bother with or even remember there was a warrantee

The advantage of buying online.

Or Home Depot. Give them your email address and attach your cards to it and then you will always have the receipt.

I can't even trust that the company will be around in 5 or 10 years. Or that they won't come back with some BS why they won't honor the warranty, and how it's my fault the bulb is bad. Long warranties are basically worthless anymore.

But when that estimate is based on 3 hours a day, and you actually use the bulb 9 or 12 or 24, the balance shifts significantly.