These changes definitely seem to take led lights closer to white.
Latest build 5.1.0+1145~g7b30d09e52 with blender-like primaries preset:
guys-i-discovered-led-5D3_9253_01.CR2.xmp (10.9 KB)
Previous build 5.1.0+1129~g70a3d9bb0c with blender-like primaries preset:
guys-i-discovered-led-5D3_9253_01.CR2 (copy).xmp (11.5 KB)
Actually even more so with preserve hue set to 1. Using latest build, compare above snapshot line preserve hue = 1 and below preserve hue = 0:
