1. IP68 protection level, the dustproof level of the lamp is divided into 6 levels. Among them, level 6 is high. The waterproof grade of lamps and lanterns is divided into 8 grades, of which grade 6 is advanced. The dustproof level of the underwater colored lights should reach level 6, and the marked symbols are: IP61--IP68. 2. Low voltage, the installation of swimming pool led must be strictly controlled below the human body safety voltage of 36V. The swimming pool underwater light is a lamp installed underwater in the swimming pool for lighting. Not only to be waterproof, but also to prevent electric shock. Therefore, its rated operating voltage is usually 12V. 3. Transformer, on the one hand, the rated working voltage of the lamp is the parameter index of the lamp, which directly determines the use environment of the lamp, that is, the actual working voltage must be consistent with the rated working voltage. On the other hand, swimming pool lights require a relatively low voltage and cannot use the daily mains voltage, so a transformer is necessary. 4.The material of the lamp housing. Different lamp housings have different application scenarios. Choose the appropriate underwater lamp according to the use site, budget and other factors. If it is used in water for a long time, the shell material of underwater lamps should have anti-corrosion function, and LED underwater lights with stainless steel shell or ABS plastic shell can be selected.