Moin, Could I use the Xiaomi 120W USB C adapter to make this Led Strip work? (BTF-LIGHTING WS2812B (5m)). I have seen that 1 Led needs about 0.25watt and there are 300leds in the 5m. 300x0.25 would be 75 Watt. Of course I connect the cable to the ESP board (NodeMCU ESP8266 V2).

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You will definitely need a separate power supply unit just for the LEDs! Maybe this link will help you for more information .... https://elektro.turanis.de/html/prj240/index.html 
Good luck!

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Question about NodeMCU ESP8266 V2 Dev Board with Lua firmware

Moin, Could I use the Xiaomi 120W USB C adapter to make this Led Strip work? (BTF-LIGHTING WS2812B (5m)). I have seen that 1 Led needs about 0.25watt and there are 300leds in the 5m. 300x0.25 would be 75 Watt. Of course I connect the cable to the ESP board (NodeMCU ESP8266 V2).