An LED has two prospects: the anode (beneficial) as well as the cathode (damaging). It is important to attach the LED the right way close to inside a circuit—LEDs are polarized elements, and reversing the polarity will prevent them from Doing the job. The Paris Salon of 1787, held on https://www.uk-exhibitionstands.co.uk/product/backlit-display-kit-08-wlt-kg-k08/