Which expert can tell me the wavelengths of the 300W high-pressure mercury lamp and the 400W metal halide lamp, such as blue light, infrared light, ultraviolet light, etc...

This problem is still a big one. First of all, the color of high-pressure mercury lamps is colder than 6000K. The main reason is the broadening of the mercury spectrum in the visible part + the conversion of part of the phosphor, but the ultraviolet radiation is definitely higher than that of metal halide lamps. (Even if it is 100W lower), the blue light part is too much, and the color rendering is very poor, about 20~30. I guess the 400W metal halide lamp you mentioned is also an ordinary quartz metal halide lamp. Its color rendering is around 70, which is much better than high-pressure mercury lamps. The luminescent elements are mainly scandium (multi-line spectrum), sodium (warm yellow) or Na (yellow), Tl (green), In (blue-violet) (color rendering is better). The color temperature of this kind of lamp is lower than that of high-pressure mercury lamp, and it is mostly neutral white, about 4000K. The radiation ratio of the two in the visible part is different. The light efficiency of metal halide lamps is higher. It is also because its radiation accounts for a much larger proportion of the visual function. In a word, metal halide lamps are better. But it should also be determined according to the specific requirements of the actual application. Because mercury lamps are cheap, their lifespan can reach 20,000 hours.

Metal halide lamps are more expensive, and their lifespan is about 10,000 hours or less (depending on the quality of the merchant)