2. Metal halide lamps can be divided into yellow light and white light, and even blue light (usually used in special environments or aquariums) is rare in the market. Metal halide lamps have the characteristics of generating strong light and illuminating a large space. Although metal halide lamps can be used for a longer time, it is best to change the bulbs once every 6-8 months to maintain good light color.

3. Metal halide lamp is a gas discharge lamp, not a tungsten bulb. Several halogen compounds are often used in light bulbs, such as indium iodide, thallium and sodium. Because sodium can emit yellow light, thallium can emit green light and indium is blue light. Because of this, the use of metal halide lamps is uneven, so the color difference of lamps will change during use, that is, with the passage of time, the color will turn yellow, then green and blue.