Frist: My brownout was a voltage drop, not a current aviable drop.
When I powered the CFL directly to the mains, only the lamp gases near to the cathodes glowed, so the cathode coating substance was working, when I approach my hand the glow area increased and then the CFL lit dim and came back to the initial state a few seconds after removing my hand. I repeat that cicle until the CFL was be able to keep its arc by itself, and when the CFL was working by itself I noticed the mains voltage flicker.
The CFL was
this. The lamp used is 20W, 220V and triphosphore.
I think my hand capacitance helped to drive the cathode coating electron emmition across the lamp. The mains voltage was way too low for affect the CFL throug my body.