ATDMS
Attention to Detail Machining and Electronic Services
Nichia 219 LED

LED's come in different sizes, different brightness levels, and they are designed for various target applications, but nothing bothers more than to have the LED make things look un-natural, or "wrong".  Many times, the LED's tint and/or main color temperature, has a significant effect in this perception of "right" vs. "wrong", as unfortunately most LED's tend to have a bluish tint.

Late in 2011 Nichia announced availability of the Nichia 219 surface mount LED, which shares the same structure as the previously released Nichia 119, but available in a package which is 100% compatible with the Cree XP-G.  Now, not every Nichia 219 is special, you need a specific bin, such as this one below (available from Illumination Supply):
You might be wondering, so what is the big deal?  These Nichia 219's are a special bin with a 4500K color temperature, and a min CRI of 92 - basically these LED's make things look "white", instead of the more typical blue or yellow tinted of the warm white.  Here bellow us an under-exposed shot of the Nichia 219 vs a warm white hi-CRI Cree XP-G - note how the Nichia on the left looks white vs. the un-natural tint of the Cree on the right:
Here in this photo you can see 6x LED's soldered to 10mm MCPCB (metal core boards) made for the XP-G - as you can see, they are interchangeable (Nichia on top, XP-G on bottom).  Note that these Nichia 219's are the same exact LED's I use in my Custom LED Shop Lamps:
Want to see/learn more?  This thread at the CPF has a LOT more photos and comparisons showing how special this particular LED really is.
Here in this photo you can see 6x LED's soldered to 10mm MCPCB (metal core boards) made for the XP-G - as you can see, they are interchangeable (Nichia on top, XP-G on bottom).  Note that these Nichia 219's are the same exact LED's I use in my Custom LED Shop Lamps: