video
https://en.wikipedia.org/wiki/Led
https://en.wikipedia.org/wiki/Led_Zeppelin
https://en.wikipedia.org/wiki/LED_lamp
https://en.wikipedia.org/wiki/Led_Zeppelin_II
https://en.wikipedia.org/wiki/Led_Zeppelin_IV
Mini Led Flashlight with LT1073 IC – ElectroSchematics.com