The Ambient Lighting Palette is made up of three powders - two of Hourglass' most popular ones, Dim Light and Radiant Light, as well as the limited edition Incandescent Light. Dim Light can be used as an all over face powder/pore perfector; Radiant and Incandescent are highlighting/glowy powders, but not of the super-shimmery variety. If you find these Ambient Lighting Powders a bit confusing (I know I did when they first came out), I'd urge you to watch JoshCollierMUA's excellent video on them!
I think Radiant Light is my favourite as it's such a warm colour, but Incandescent Light is pretty special, too. You all know I love my Dim Light powder, and no, I don't regret having it again in this palette because I use it so much!. Overall, this is probably one of the best (and most usable) "holiday" palettes that I've seen so far. If you're tempted, I'd say go for it - it's one of the best high-end items I've bought in ages.