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 Integral LED ILBHA043, 4000 K, 2500 lm, IP66, Black Integral LED ILBHA043. Product colour: Black, Shape: Round, Mounting type: Surfaced. Light colour: Cool white, Colour temperature: 4000 K, Bulb lifetime: 35000 h. Energy efficiency class: F, Energy consumption per 1000 hours: 24 kWh, Energy efficiency scale: A to G. Depth: 103 mm, Weight: 1.24 kg, Diameter: 35 cm. Package width: 108 mm, Package height: 355 mm, Package length: 35.5 cm