My lamp says "Max 40W or Energy Saving 8W".
I have a halogen bulb which says "28W = 36W".
Is it safe to use with the lamp? Why / why not?
(Sorry if the answer is easily available on the web - I did search before posting here!)
The safety concern is about heat, not light. For the safety label concern, you can put 40 actual watts of whatever you want in there.
But the real world is a bit more complex. Incandescent and halogen will run hot with little fuss. CFL's and even more so LED's have electronics that degrade under heat, and LEDs loose efficiency with heat. This is why both perform quite poorly in can lights and enclosed fixtures.
All that said your 28W halogen in a 40W fixture is just fine. I'd stick to a 18W or less CFL or LED for operation heat (not safety heat) reasons.
I would think that you should be OK. You're using a 28W appliance in a 40W fitting, which is within recommended specifications.
As far as I understand, energy-saving bulbs are either CFLs (compact fluorescent lamps) or LEDs (light-emitting diodes). A halogen bulb is still an incandescent bulb, but the materials it is built with are different.
Your halogen bulb's label indicates that it consumes 28W to produce the light output of an average incandescent bulb that consumes 36W, hence saves power. But it isn't an energy-efficient bulb when compared with other available types, such as CFLs or LEDs.
Yes. Because the 28w it will use is below the 40w rating for the lamp.
Johnny: I think the light manufacturer is saying: You can use a 40w incandescent or an 8w CFL since both give the same lumens of light. I think it is unintentionally confusing though because one may think that the maximum CFL wattage allowed is 8w, when any CFL up to 40w would be okay.