You can save energy using 3-way light bulbs. Personally, I don’t much care for 3-way light bulbs, but some folks do.
The problem I have is that I usually set them on high and never use the low or medium setting. I end up putting in a single speed 150-Watt bulb that saves on the purchase cost.
My wife likes 3-way lamps. The table lamp where she sits in our living room has one.
She uses the high power setting is for sewing, medium power for reading and low power is for watching TV. That results in energy savings some of the time.
I call it her pilot light, because it never goes out when she is home.
Most old incandescent 3-way light bulbs are a combination of a 50-Watt and a 100-Watt filament inside one bulb. With both turned on you get a 150 Watt lamp. They cost about $3 and don’t last very long.
The newer Compact Fluorescent Lamp 3-way light bulbs give about the same amount of light and use 14, 19 or 32 Watts depending on the setting. The lower Wattage does provide a good energy savings. They cost about $10 each but last a lot longer than the old Thomas Edison style bulbs do.
How to really save energy with them
If you use either a dimmer switch or 3-way lamps in your television room, you can save a significant amount of electricity.
Step one; dim the lights when the TV is on.
Step two; adjust the brightness on your TV to look its best when the lights are dimmed.
You save twice this way.
First, the dimmed lights use less power.
Second, the TV uses much less power when it is not as bright as it was set for in the store. You get a better TV picture and the TV uses less power went it is adjusted for optimum picture quality in a room with the lights dimmed.
It could make a 5 or 10 dollar a month savings on your electric bill. Plus, it will reduce eyestrain and you get the best possible TV picture. Your actual savings depends on how much you watch TV and how big your TV is.