I have not done any 921s yet (though I have replaced one switch). but I'm switching my 1141s to LED, got most of 'em done.
And soon (as soon as the tubes fail) I will be replacing the florcesents with LED strips as well.. Testing one now and it's doing ery well and it's very white, I like it.. Got one meter of LED's beside me and 2 more rolls on the way. (Oh and I seriously doubt you can beat my price on those last two rolls... FREE). (Watch SwagBucks videos, Get Amazon.Com gift card, Buy 48.5 bucks worth of stuff,, Total cost to me.. 0.00 incldes shipping and handling (free if over 35 bucks) Nice)
Home is where I park it!