Different issues have to be dealt with by manufacturers when producing LEDs. Because the electrical components must be integrated, LED bulbs are subjected to temperature and chemical stress during manufacture.
Peak temperatures during welding can even approach 260° C, which the LED won't attain over the course of its lifespan. Due to the chemicals used during welding, LEDs are also subjected to chemical stress, which forces producers to use the most durable material possible. Because ceramic is so heat-resistant and nearly completely chemically inert, the plastic support of power LEDs, for instance, has been replaced with ceramic.
The material that responds best in terms of optical stability to safeguard the phosphor, which is essential for turning the blue LED into white light, is silicone. Silicone is susceptible to some chemical agents including volatile organic compounds (VOCs), despite being highly resistant to heat, chemical agents, and oxidation.
Some of these substances might already be present during the manufacturing process, while others might be present in the area where the LED will be installed. For instance, varnishing paints used in some manufacturing facilities may contain substances that, despite being largely eliminated by suction hoods, tend to build up upwards and towards the ceiling, where lights are installed.
