Does any one know of a powder highlighter or luminizer? I've been trying to find one for a long time but I haven't had any luck. I have tried light brozers with a shimmer but I'm looking for something that wouldn't really bronze the skin.

Of the top of my head, MAC do nice iridescent loose powders that come in huge jars, and you only need a tiny bit. Also try looking at shimmery or pearlescent pigments or eyeshadows. Some of the colours in the Urban Decay Naked palettes work well as highlighters.

DP

I love this one from The Balm: http://www.thebalm.com/makeup/maryloumanizer.htm

bobbi brown and topshop have really lovely powder highlighters.
luminizers are usually cream/liquid type products- there's mac strobe cream, benefit has a ton of liquid highlighters, becca shimmering skin perfector etc

I have 3 pigments from Magnolia makeup that are now my holy grail, they come in a larger container and you only need the slightest bit of product to get the effect you need. Milani and Black Radiance also have great bronzers/highlighters.

I have one from Smashbox Artificial light luminizing powder, but I don't think they make it anymore cos now I can't seem to find it in the store....Tiny stupid packaging but I love it, VERY luminizing

Yaby makes some nice ones. They're not super crazy shimmery, so they look nice for day to day wear, but they still photograph beautifully. They also make some nice light ones for paler skin that won't turn out bronze. You can buy them all in a little palette too, I use mine all the time

http://www.yabycosmetics.com/highlight-pre-set-palette

Bobbi Brown's shimmer bricks are amazing...the one below is in Apricot and The V.S. Illuminating powder is AMAZING...I keep it in my kit at all times!