The SL18 bulb was stated as being equivalent to a 60w bulb. Our tests show that it is NOT as bright and does not have a steady brightness.

The SL25 bulb was stated as being equivalent to a 100w bulb. Although we didn't compare this directly, you can see that the bulb is hardly brighter than the standard 60w bulb, and at times is a good deal dimmer. It does not give a steady light.

In terms of light output we conclude that the standard 60w bulb is better than the energy saver bulbs.

Standard 60 watt bulb

SL18 energy saver bulb

SL25 energy saver bulb