[Marsupial]

When I read "fun with LDE lamps" I tough you were playing with red or blue leds... !

I actually gave that a try on my 47-1230, one different color on each side. Makes a cool effect in that the pointer (a bar, really) separate the 2 colors.
However, I really like the natural look of warm incandescent... but on some of those repaint I see every now and then, colored LEDs might be interesting.

The biggest gain I see about using LEDs is longer material life near the lamps. Dials or other tends to age faster when heated.