neon lights pulstaing with subs?

I was thinking about hooking up some lights to my speaker box that can light up and darken as the bass hits and shuts off...How would you wire this? Run a spare wire out of your speaker ports to them? How would you know what wattage you would need your lights to be? Any suggestions. My subs are 150 rms each, 3 of em, currently using a dinky pioneer amp with only one channel working but im gonna get a new 1. ANY SUGGESTIONS?

they make neons that do just what you're talking about

(insert company and link that I do not know here)

EDIT:

ahh here we go:

Pusling neons (http://www.jcwhitney.com/webapp/wcs/stores/servlet/ProductDisplay?productId=7002&catalogId=10101&langId=-1&storeId=10101)

or back one page to all Lighting: click here (http://www.jcwhitney.com/webapp/wcs/stores/servlet/EndecaCategoryView?catalogId=10101&Nao=0&Ne=100003226&N=111+100003226&langId=-1&tmplframe=EndecaCategoryView&section=body&storeId=10101&tmplhome=StoreCatalogDisplay&ss=10101)

I think street glow makes a kit for that.

my friends car does that, except he has one for high frequencies and one for low frequncies, he has a blue LED undercar kit that flashes with the bass, also light tubes under his seat, under the dash, and he has green leds for the high frequencies, but when he plays a slow song it sounds/looks really horrible, because the lights are just on lol