Testing light bulbs before any point of purchase is a part of Indonesia's culture and retail experience as consumer need to make sure that the light bulbs work before they decide to buy them. However this practice is inconvenient and time consuming. So Leuch'Tech came up with a series of packaging design that does not require the light bulb to be taken out for testing. Each packaging has been designed with layers of hidden graphic that can only be revealed through the brightness of the light bulb. Giving the consumers a fun experience every time they turn on the lights.