Right, lighting lesson.
When buying lamps, don't go by wattage - not now a days. I can get a 10 W lamp which will give out far more light than a traditional 60W incandescent lamp - go by lumens - it's the only unit which truly represents what a lamp is doing especially nowadays.
This goes for ALL your lamps, house or car - cheap H4 lamps will have a lower lumen count than good branded ones for example. I use Osram and they were like night and day from I think Ring lamps I took out.
Lumens (lm) is the unit used to measure visible light emitted from a source.
Kelvin (K) is the unit used to measure the colour temperature of the source. Halogen down lights are about 2700/3000K, light looks white from about 4000K and 6500K is the blue light you see on HID headlights (no reason for them to be bloody blue - you get 2700K HID lamps)
If a lamp doesn't have a lumen rating on it question it's quality. Phillips 11W CFL lamp (energy saver) widely available from supermarkets and B&Q is 600 lumens for the 2700K version. A good old fashioned 60W lamp (depending on manufacturer and clear or opal) was about 600 lumens.
When buying lamps consider colour temp, I hate seeing mixed colour temperatures in a space. Nice warm lighting in a living room then a bright near blue lamp burning away in the pendant light... Looks awful and these people must feel cold! Nice white bathrooms with lots of chrome look great under lots of 4000K light, exposed wood and darker colours look better with warmer light.
So basically shop around wisely for your spotlights and lamps and you can do so much more with less energy, also consider quality fittings with good optics and reflectors - 50W can do a hell of a lot more in a good light than 100W in a cheap eBay spot light.
So look out for good 55W lamps which may be as bright as a cheap 100W - yes really.