Great light. I was able to adjust the strength of the light with the same dimmer as I used for my 5W Halogen lights.
This was much brighter, and makes the halogen lights look very yellow and weak in comparison.
I could not diffirentiate the brightness of this to item 00515730, and as this one uses less power and is cheaper, this is a great buy.
Cons: The build quality of this light was not as good as item 00621533 (they had the same price at the time I bought them).
So I would recommend item 00621533.