I have a desk lamp, that uses 11W/827 CFLs (current one is an Osram Dulux S)
The lamp uses a power supply ("Type BL1"), but it seems the transformer acts more like an AC/AC power converter, as it outputs ~230V AC (I live in Germany, we have 240V AC here.) I opened up the power supply, and the cables going off to the CFL tube, go directly from the secondary, there is no rectifier, etc. I measured the voltage that goes into the CFL at the terminals, it's the ~230V AC.
The ignition circuit must be therefore inside the (sealed) CFL casing.
I was wondering, if I could make or re-purpose a dimmer switch for this lamp. The idea is to put the dimmer after the power supply. The only dimmer switches I found, were rated for 60W-500W, which is way overkill for the 11W CFL.
What's the best approach? Could anyone suggest me a circuit for such a dimmer?