[ken0042]

Originally Posted by ranchlandsselling

These what I want? I pulled my bulbs and they were 921, the exterior, bathroom ceiling, seems like all the lights are 921
http://www.dx.com/p/t15-t13-921-1-3w...7#.U5jjIG9OWAg

hmm, maybe not - in the 2013 thread it said T10, not sure what I need. I just have little glass bulbs I pulled that have a 921 written on them.

This one is a T10, but doesn't say 921 anywhere.
http://www.dx.com/p/t10-194-w5w-0-5w...6#.U5jlum9OWAg

Those will "work", but aren't nearly bright enough. They are advertised to be about 40-50% as bright as a regular bulb.

However you are right that you want the T10 to replace your 921 bulbs. With North American auto bulbs the numbers mean something; this may not be right, but 921 is rated for 21 watts at 9 volts. Because LEDs don't use wattage the same, they simply refer to the base most of the time. Your 921 bulbs have a T10 base.

You want at least 200 Lumens; which is brightness. These are 270 lm:
http://www.dx.com/p/t10-2-5w-270lm-1...6#.U5jtG5j4CY0

Or these at 170:
http://www.dx.com/p/t10-1-9w-6500k-1...8#.U5jtfpj4CY0