I am confused hopefully someone can explain! I went to buy a new 100watt daylight bulb. LED version is 13 watt. The Osram 13watt is €10 and has a D energy rating. The Philips also 13watts was €27 and had an A energy rating.

They are Both 13watt. Same energy consumption. How can one carry a A rating and the other a D?

#EnergyRating. #LEDBulb