Brought home my first batch of CFC 13W bulbs. I put one in my front porch light as I like to leave this on and let my dusk-to-dawn adapter turn the power on and off, depending on daylight/nighttime. But the CFC pulses quickly and I have determined it is the adapter causing it (doesn't do it when I screw bulb directly into fixture). I don't recall the adapter having any kind of power modulation feature - it is just supposed to turn the light on at dusk and off at dawn. So is this an issue with using this type of bulb in the adapter, or is maybe my adapter bad? I never noticed it with the standard bulb in it although I know the bulb seemed dimmer than it should have been.