F means that the product is rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Regulation 2017/1369/EU. F Philips CorePro, 5.5 W, 40 W, E27, 470 lm, 15000 h, Warm white Philips CorePro. Bulb power: 5.5 W, Equivalent bulb power: 40 W, Fitting/cap type: E27, Luminous flux: 470 lm, Bulb lifetime: 15000 h, Light colour: Warm white, Colour temperature: 3000 K, Beam angle (max): 200°, Color Rendering Index (CRI): 80, Power factor: 0.5