In case the semiconductor product is translucent, the light will likely be emitted within the junction as junction functions as the source of mild. LED is operated in forward biased method only. If it will eventually operate in reverse biased it can get injury because it can not with stand https://www.uk-exhibitionstands.co.uk/product/casonara-blimp-cube-360o-hanging-light-box-display-200l/