According to the proportion of the distribution of luminous flux in the upper and lower space, it can be divided into five categories: direct type, semi direct type, diffuse type, semi indirect type, and indirect type. 1. Direct type: The vast majority of luminous flux directly projects below, so the utilization rate of electrical luminous flux is the highest. 2. Semi direct type: Most of the light flux is directed towards the lower hemisphere space, with a small portion directed upwards. The component directed upwards will reduce the hardness of shadows generated by the lighting environment and improve the brightness ratio of each surface. 3. Diffuse type: Electrical appliances have almost the same amount of light flux up and down, and this type of appliance evenly projects light in all directions, resulting in a low utilization rate of light flux. 4. Semi indirect type: Downward light flux accounts for 10% -40%, and its downward component is often only used to generate brightness that is proportional to the ceiling. It is mainly used for building decoration lighting, increasing indoor indirect light, and making the light softer and more pleasant. 5. Indirect lighting fixtures: A small portion of the light passes downwards, achieving a soft and shadowless lighting effect
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