For layout lighting I went from 2700K halogens to 3100K LEDs and then finally to 5000K LEDs, all in PAR20 form for my track lighting. I highly recommend trying a few different brands and reading the packaging carefully. They call 3100K Bright White and 5000K Daylight but it's mostly marketing from what I can see. The other factor is CRI, the higher the better (and more $$). The Home Depot stuff is good enough I think and that's what I run. Here are some compare-o shots via iPhone. You can see even with a quick pic the diff in color temp in the first shot. You can see the 'stripe' right in the center of my yard in the second shot with one or two 5000s in place among the 3100s. I was really interested in getting a more blue sky and was pleased that is seemed to render greens a little nicer too.
