The mathematics of loading can be complex, but please follow them simply the lump number of luminaries is referred to n. The number in which you calculate the number of luminaries to put into a space. This can be done with the following formula number of equals lumens required Lux by length by width of a room divided by lamps per luminary times by luminaries per lap including the utilization factor and luminous loss factor or light loss factor. Light loss factor takes account for the depreciation over time of a lamp output and the dirt accumulation on the fitting and walls of a building. The usual realization factor relates to the quantity of LOD that mot finally reached the working plane to the quantity of light initially emitted by the lamp. But it does not allow for the gradual loss of loss due to aging of the lamp and the materials used in the construction of the luminary or the effect of accumulation of dirt on the luminary or walls and ceilings for which it is reflecting off.

To allow for this additional loss, a light loss factor has been introduced into equations. This must be defined as a ratio of the average luminaires at the nominated maintenance period, to that which it is installed as a new an office interior can be cleaned in location, but it can still be approximately point seven lower than its original reflectance level in some dirty locations. Such as factories, the luminous factor or light loss factor can be as low as point six of the original luminous factor. Typical light loss factor values include air conditioned Office of point eight, I clean industrial Office of point seven, and a dirty industrial office or point six, even as low as point five in some dark, dingy industrial offices, this is highly not recommended. Reflection factors of a room surface can vary. Walls are normally finished in darker colors than that of the ceilings and the wall reflectance values.

Therefore always slightly lower. This can be considered 95% of the initial lot which falls on the walls and 95% Loss of lat can be considered for which loss falls on Windows and passes outside the room, which reduces the average reflection value of a wall in a room. As a general guide wall reflection values are as follows 50% of the reflectance when light falls on small window areas at 30% loss in medium colored walls with a small window area and light colors with large window areas. There is a 10% reflectance of loss with dark colored walls and small window areas, or an interior with a window or glass partition on at least two sides. Unless light colored blondes can be drawn across the windows that not their reflectance value is very low, less than 5%. Please take this into consideration when selecting lights with high transparent or glazed materials, ceilings, it would be impractical to give reflectance Valley for every talk of ceiling and in a similar manner to be adopted for walls.

Ceiling reflection factors can be divided into three main groups flat, unobstructed ceilings, finished in white or near White will reflect 70% of light. There is a 50% reflectance of lot on flat on obscured ceilings finished in a lot color and a 30% reflectance of flat on flat unobstructed ceilings finished in a medium color