... lamp, no need gear box, for factory/indoor lighting high bay indoor lighting:1. specially designed for self-ballast metal halide lamp, can ... indoor lighting.2. With high reflection, the reflection ratio can be up to 90%, and 20% of light shine upwards, effectively reduce ... / 400W 6. Sizes: two sizes available (pls check below sizes) 1). height: 400MM, diameter: 410MM 2). height: 430mm, diameter 490MMP. ...