The most common application is LED downlight, where multiple leds are mixed in an optical cavity and projected through a diffusion plate. The advantages are low requirements for light source consistency, soft and uniform surface, and economical cost. It is worth mentioning that the panel lamp is also a special mixed cavity light distribution. The disadvantage is that it is difficult to realize light distribution at a small Angle. It is worth mentioning that the medium blue ray electric NanoD series can directly replace the diffuser plate to achieve light distribution of 50, 60, 70, 80, 90 and 100 degrees, paving the way for the flattening of lamps again

Combined light control refers to the realization of optical optimization through the combined application of the above techniques. Panel anti-dazzle office lighting is the current mainstream product panel lights, it is necessary to introduce the panel lights anti-dazzle technology, because modern people have more than one-third of the time in such lighting environment work. The era of traditional anti-dazzle is mainly composed of reflector and the light grille hard to finish, the optical system on the panel lights system cannot be used, since neither straight down type panel lights or light type panel lights the shiny surface flush with smallpox, do not have space in which hard light, so we adopt plate to reduce the UGR anti-dazzle way.

Many people have a misconception that UGR is a parameter of the lamp itself, just like color temperature and light effect. In fact, UGR refers to the uncomfortable lighting environment for human eyes. UGR is a value calculated by various parameters related to the generation of glare that represents the uncomfortable glare degree of the entire lighting space. To put it simply, UGR value is not only related to the lamp, but also related to the size of the room, the reflectivity of the room, and the direction of the observer's observation. And when we get a optical parameters of lamps and lanterns, there is one page called UGR data table, the so-called UGR < 19 what we see is the form, in fact it is in order to facilitate everybody fast identification of lamps and lanterns of anti-glare capability defines a space, all the lamps and lanterns of single placed in such a space allotted for evaluation of a set of data. In data in the table (table 2), is based on human eyes to the ceiling height H = 2 m, arrangement of lamps and lanterns S = 0.25 H = 0.5 m, define the 5 groups of different reflectivity of smallpox, wall, floor of a given space, the space the size of the width information by X, Y, given the maximum size of the single space is generally not more than 4 h8h x16 8 meters, reflectivity of the most commonly used is the first set of ceiling, metope, the reflectivity of the ground were 0.7, 0.5, 0.2, Therefore, what is the UGR value of a lamp? Generally, we simply read the 4H8H crossover and the first data forward, and take the large value. In Table 2, we take 19.3 as the basis for comparison. When the actual distance of the lamp is changed, the arrangement of the lamp may change due to different observation positions. A range value of possible changes is given in the table. At the bottom of the table, according to CIE117, UGR is modified according to the actual luminous flux of lamps. The standard UGR is defined according to 1000lm of a single lamp, 

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