Finally got some of these to try.
Holy shit! The item number is perfect. These are the brightest LED's I've seen yet. They are brighter than the CT Ultra's, so I will use these when cool white is appropriate, and will still spend the extra money for the Ultra Warm's when needed.
But man, these suckers are BRIGHT. I'd never use them under an insert, that's for sure. I don't think that they would be great for GI either, other than spots to brighten parts of a PF.
Put some in the spots on my MM pointing at the castle. The game had purple 3 LED's in there before. The new 4 LEDs were WAY brighter made a huge difference.
Brightest. LED. Ever.