Each lamp should have this label mark on packaging.
• A to G is the energy class that the lamp have. This is the link between consumption / performance. A is the best in energy efficiency class and G is low in energy efficiency. The modern economy bulbs belong in energy class A.
• In Lumen indicates how many lumens have the lamp. (See in explanations of what does lumen means). • In Watt indicates how many Watts the bulb consumes. • The h indicates the life time in hours.