Spoke lights are primarily vanity/flair minded. They are cool to have but they don't add much to your safety because they don't shine in the directions where you want to shine (straight ahead and straight back).

There are pages and pages written on this in the electronics & lighting forum. I currently run a Cygolite Metro 300 in front. If you were open to the idea of another $30 spoke light, you can afford a $50 Metro 300. It's very bright (though the beam is rather narrow) and rechargeable via USB.

In the rear, I run $30 Cygoline Hotshot, it's likewise bright and directional. I've been paying attention to other cyclists' tail lights recently. About the only tail light I saw that was comparable to mine was Axiom Pulse 60. (Performance Bike has them for $35) Not sure which one of these two is brighter - haven't compared them side by side - but either one would be a good choice for a safety conscious commuter.