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 929001890494, 4.3 W, 40 W, E14, 470 lm, 15000 h, Warm white Philips 929001890494. Bulb power: 4.3 W, Equivalent bulb power: 40 W, Fitting/cap type: E14, Luminous flux: 470 lm, Bulb lifetime: 15000 h, Light color: Warm white, Color temperature: 2700 K, Beam angle (max): 300°, Color Rendering Index (CRI): 80, Power factor: 0.52