CFL

Full Spectrum Light Bulb - ALZO 45 watt Photo CFL 5500K - Case of 4 - Daylight balanced 5500K - pure white light
$39.00
My other full spectrum lights cost somewhere $90 or above for the hardware and $20 average for the replacement bulb. These CFL deliver the same effect, or better while cost far less.

The size of the bulb is about 2.5" diameter x 7.5" long (including the socket), so make sure it fits your fixture before jumping on it. As far as the full spectrum portion of it, it is very good.

Earthmate EP2352AK 23-Watt Super Mini-Spiral CFL 2700K Bulb, 6-Pack
$44.94
If you are just starting out with CFL's this is a great bulb to begin with. It has that similar warm color to the traditional incandescent bulbs you are used to and not that "white" light that many other CFL's put out. So if you have never used CFL's before these are great and the one to start with. Plus they are the super mini size, not just compact, which means they are so small they fit in just about every light fixture. These are way better than any bulb I purchased from my local home improvement store, and less expensive too. My only complaint is that they are advertised as "instant on" but they are not. I guess it depends on what you mean by instant on. Yes, they do turn on right away, but they are very dim and don't get up to a descent brightness for at least 20 seconds, maybe 30. So keep that in mind as to where you use them, as this is a big negative if used in certain areas where you need immediate light. If they did turn on at full brightness right away I would have given this 5 stars. Still, it's well built, nice packaging, 1/4 the mercury in other CFL bulbs, very small super mini size, and the normal incandescent color you are used to - this is a fantastic bulb.

GE 47448 12-Watt, 23-Watt, 29-Watt (50/100/150 Watt equivalent) Energy Smart Spiral 3-Way 6 Year Life Light Bulb
$14.99
We love the light from this bulb. As with all of these energy efficient bulbs you need to wait a small amount of time for the true level of light to be achieved and that is the case here with each of the three levels of light. You do not need to wait for each level and can easily just switch to the highest level immediately and then it comes up to the brightest for that level in just a quick amount of time. I'm so used to it now that I barely notice the warm up period but I definitely enjoy the brightness (just exactly as bright, or a little brighter, than our old 50/100/150 bulbs) and I will be enjoying the benefits of a lower electricity bill for years to come. Highly recommend! We are back now to buy a couple more so all the three way lamps in the house will be energy efficient.

P.S., as far as the size of the bulb, yes, these energy efficient bulbs are all slightly larger than normal bulbs. However, I have not replaced any lamp harps and have had not trouble fitting the bulbs into our lamps.

Feit Electric ESL40TN/D 42-Watt Compact Fluorescent High-Wattage Bulb, Daylight
$8.99
This light is very bright and lights the whole area up better than regular bulbs.