After these LED's were proved in use by some chums I bit and spent $50 to replace all the halogen bulbs. These are the round puck lights.
The source is a difficult web site.
First, go here Superbright.
Then scroll down to G4 Side-Pin Lamps with High Power LEDs
Click on the tab G4-xHP6-DAC High Power SMD Disc Lamp - The six LED lamps.
Of course, the web site will probably change before you read this, just remember you are looking for G4 Side pin lamps.
I got the Cool White. Most people prefer a warmer color. Cool white is closer to the halogen than the warm white. The warm white is pinkish to me.