The general use of the 8 inch downlight can reach 8 inch downlight, power more than 20W, the light flux can be more than 2000LM, more than 3 meters to illumination 300LX.
The height of the office is below 3 meters, that is to say, the illuminance of 3 meters is over 300LX. This requires each lamp irradiation mask downlight is 3 meters, light emitting angle of the light tube is greater than 60 degrees above. This requires the brightness of more than 2000LM downlight.
In order to reach the minimum illumination 300LUX as an example, the total illumination is 35*300 = 10500LM, 12 lamps per lamp lamp illumination should be at least 10500/12 = 875LM.
In general the ceiling height under the condition of illumination and lamp lamp selection key is relatively little, light source.
