The Energy rating charts for electrical devices get updated fairly regularly as devices get more efficient.
On an old chart, an LED lamp would probably get an A++++++ rating!
The last up date for lamp bulbs, in Europe, was 2019 so relatively recently. This measures efficacy (lm/W) so is basically showing how much light is given out per Watt of electricity.
Non-LED bulbs would not even appear on this new chart. Also note, there is no efficiency rating higher than an A so you won't find an A+.
The difference between an A and an F is roughly that an A will give out twice as much light per Watt as an F.
A smart bulb will always use a little more power than a non-smart equivalent but this difference is negligible in real terms.
(If people are worried about this sort of difference then they could make much bigger savings in their homes by speeding up the time that their fridge door is open, for example).
However, in real usage terms, the difference is not so great as smart bulbs are quite often set at at a less bright setting than fully on, and when set up in a smart home system, they are more than often off unless someone is in the room.
In terms of energy usage per hour, an E27 Philips Hue lamp equivalent in brightness to a 100W filament bulb, and with the new 'F' rating, will use 0.016KW/Hour.
A filament bulb will use 0.1KW/Hour.
That is a massive difference.
In conclusion, don't worry about the "F" rating!
Insanity
It's still A to G. The differences are minimal.
So for a week or two I’ve been wasting my time and banging my head against the wall.
Thank you Tom for setting me on the lighted path.
New European Bulb Standard A —> G
This is a better explanation of the subject discussed and may help future searches.
Thank you
The first three posts could also be pruned as they have become irrelevant.