Twilight- You don't need to remove the bumper to take them off. Two philips head screws remove them. They can be seen from the front of the car. I'd say it takes literally less than a minute to remove them.
Yes they light up BRIGHT like the GM day time lights. I will take a picture of them during the day. They light up much, much, MUCH brither than the turn signals.
We were going to wire them up as turn signals, but decided against it. I wired them up into an independent switch, so I can turn them off and on whenever I want.
Did not take them off a car in the parking lot. ;-)
And wig-wags are coming soon.
Bob-Sylvania does offer turn singals in that size, and I've been looking into it. I just checked out their site last night after the install, and they said see your local retailer. <_<