I can't comment on the quality and performance of the bulbs as I was unable to use them. On opening the first box I saw a warning about the type of dimmer that should be used with these bulbs. I ordered the recommended dimmer but these bulbs refused to work with it! I contacted the company that makes the dimmer who had never heard of this make of bulb and said that they had only tested their dimmer with Philips and Megaman bulbs. I ordered 2 Megaman bulbs and everything is now working perfectly. Fortunately the company that sold the original bulbs immediately agreed to take them back so all was satisfactorily resolved. led's can it seems, be a minefield.