The life given on the inkandstuff website (from which I bought the eveready bulbs) was 20,000 hours. They no longer stock the bulbs. The Eveready brochure gives the life as 8,000 hours. The bulbs warm to full brightness faster than Megaman (the slowest) or Pro-lite. They are brighter than Megaman and about the same as Pro-lite. I have some doubts about quoted lifetimes. Two of the Pro-lite failed immediately and were replaced by the suppliers. I have had no trouble since. Two Megaman bulbs have failed after less than 500 hours. Others are noticeably dimmer than when first installed. I would not buy Megaman again.