LED lamp

#include <FastLED.h>

#define NUM_LEDS 25
#define DATA_PIN 6

CRGB leds[NUM_LEDS];

void setup() { 
    FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
}

void loop() { 
  leds[0] = CRGB::Red;
  FastLED.show();
  delay(500);
  
  // Now turn the LED off, then pause
  leds[0] = CRGB::Black;
  FastLED.show();
  delay(500);
}