I replaced a similiar kitchen setup with lamps by Megaman 11w compact gu10

You will probably need new lamp holders as the CF are longer in size.
Sure light output is down and start up from cold a little longer, but the running costs and the reduced hassle of changing bulbs is great.
IMHO they are also significantly safer as many 50w lamps run far to hot and commonly cause damage to cables were they are not installed well.
Bottom line is the guilt of burning 650w is reduced to 132w.
If you dig deep enough the Megaman CF has various colour temps to give a warmer less white light and even have a dimmer CL that works just by toggling the on/off switch. Very impressed compared to the earlier generation 7w/9w really bad CF GU10 efforts.