Bob,
I have the chrome covered bulbs from Auto Barn...
http://www.autobarn.net/pivachbu.html
I thought they didn't shine as bright as the original amber bulbs and started giving hand signals to make sure the people in back knew I was turning, but I did that with some guys I knew who were fillowing me and they asked why. I told them I didn't think they could see the turn signal and they said it was fine. So now I just use the blinker.