I have just seen this post now.
We switched on the first court in 2009 and, until now, we have more than 40 courts lit by Hi-Power LED.
I believe we made very good experience and most of comments from players and teachers at the clubs are more than positive to enthusiastic.
We did it with (mostly) 5000k temperature, in some cases higher but I don't personally recommend it.
The best tech. result we got it's 0,92 uniformity in an indoor double court structure with wooden ceiling.
All of "our" courts are indoor or "convertible"
, but we'll switch on soon outdoor courts with 4 or 6 poles each, keeping great uniformity (>0.84). With 4 poles only seems even better at the lighting project level.
I don't think I'm allowed to publish our link here but if you google around you'll easily find some info from Italy.