headlight improvement for my '91 ????

I'm looking to improve the headlights on my '91 GMC, (better/brighter). I know I could upgrade the bulbs to something different, but I have heard of wiring them so that all 4 lights are on when you switch to hi-beam. (good wiring, relays,...) Anyone do this? Is there a kit available?
Thanks for any help!
-Gerald.

Thanks for the info! I found the kit at the Painless website. Sounds like thats the way to go.