If I find that the waterproof light switch has changed color, can I still use it?

Firstly, discoloration may be caused by prolonged use, environmental factors such as humidity, temperature changes, or material aging. These factors may cause changes in the coating or material of the switch surface, resulting in discoloration.
If the discoloration is only a slight appearance change and the function of the switch is still normal without poor contact, inflexible operation, or other safety hazards, then theoretically it can continue to be used. However, it should be noted that discoloration may be a sign of switch aging, indicating that its service life may be nearing its end.
However, if discoloration is accompanied by abnormal switch function, such as poor contact, difficulty in operation, or safety hazards such as short circuits, the use should be immediately stopped and a new waterproof light switch should be considered for replacement. Because the switch may have lost its waterproof performance and safety at this point, continued use may cause damage to personal safety or equipment.
Before deciding whether to continue using, it is recommended to conduct the following checks:
Check if the contact parts of the switch are clean and free of rust or oxides.
Gently operate the switch and check if it is flexible and there is no jamming phenomenon.
Observe whether there are signs of water leakage or electric leakage around the switch.
If all the above checks are normal and the discoloration does not affect the normal use of the switch, it can be considered to continue using it temporarily. But for safety reasons, it is recommended to regularly check the status of the switch and replace it promptly if necessary.