I have long suspected that the claims made for energy efficient light globes is nonsense so armed with google I did a bit of research
The claim for energy efficient globes (Compact fluorescent lamp)
- More environmentally Friendly
- As good as existing light globes
Let me take these items one at a time
More environmentally Friendly
These bulbs are much more energy and resource intensive to manufacture and they also contain mercury making them difficult to dispose of properly.
Use less electricity
They do use less electricity however they are basically using the same technology as old fashioned fluorescent strip lights and they share the efficiency profile of these. If you turn these lights and never turn them off they use about a quarter of the energy of a conventional bulb. However if you turn your lights on and off frequently (like we do) then the efficiency goes right down because these bulbs (just like fluorescent strip lights are a lot less efficient when being turned on and off).
As good as existing light globes
I hate the light from these (the wave spectra is different). They also take a while to get to full brightness. They have also been shown to cause epilepsy and they can buzz. The EPA take the safety and disposal of these pretty seriously if you break one you need to evacuate the room for 15 minutes and dispose of the bulb in a glass jar
I suspect if you have a modern house with electrics then they would last longer but I frequently have these (expensive) babies blow on me. Also as they get older they get less bright. The life is also dramatically shortened by turning them on and off.
SOURCES – WIKIPEADIA