Even light bulbs have an energy rating, and this one is F-rated. As for the brightness, this light bulb clocks in at 470 lumen.
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From Amazon
LEDVANCE Smart LEDLamp with WiFi Technology, Base: E14, Di mmable, Tunable White (2700-6500K), RGB Colors Changeable, Replaces Incandescent Lamps with 40 W, SMART+ WiFi MINI Bulb Multicolour, 1-Pack
Conrad Electronic
LEDVANCE SMART+ EEC: F (A - G) SMART+ WiFi Mini Bulb Dimmable 40 5 W/2700K E14 E14 Warm white