Lightbulbs

Being an ecologically minded fellow I bought some energy saving lightbulbs. This time the 20 watts variety, the normal ones seem to be about 11watts and just arn't bright enough. The 20's are better but they still take 2-3 minutes to warm up to full brightness, and 20 watts is only one fifth of a standard 100 watt bulb so it costs the same to run for 5 hours that a standard bulb does for one hour. They should therefore save me some electricity and reduce the old carbon footprint.