I bought one type of 921==>>LED on Amazon that failed right away. Then a package of a few that have been OK so far. Next, I replaced a whole ceiling light with one by Command Electronics (who seem to be a significant supplier to RV builders) that was already LED from Amazon. It's good, but switch is only On/Off, not One End/Both Ends. Next, I found another deal with four or five lights with the two-way switches, around $50 for the group. I think that'll be my next upgrade.