I tried this on a stock 3D mag today using the same etching cream as Warhoggie. I left it on the bulb for about three and a half minutes. As far as I can see there is very little difference in terms of overall output between the frosted bulb and the stock bulb. The major difference is that the frosted doesn't have the throw of the clear bulb. By frosting the bulb you're essentially increasing the size of the light source which decreases throw.