1. Brightness: Brightness refers to the area of a micro-unit surrounding a certain surface, the luminous intensity emitted in a given direction divided by the area projected to the same direction by the unit, the unit is: cd/c㎡. The concept of brightness is generally not encountered in lighting systems. 2. Illuminance: Illuminance refers to the luminous flux density on a surface, which is the luminous flux injected into a unit area, and the unit is LX.
The definition and measurement of illuminance are more complicated, such as average cylindrical illuminance, equivalent spherical illuminance, scalar illuminance, etc., and their measurement conditions and calculation methods are different. It is often encountered in architectural and decoration engineering, and occasionally the concept of illuminance is involved in lighting systems. 3. Luminous flux: Luminous flux refers to the energy that the light source radiates to the surrounding space per unit time, which can cause visual reactions, that is, the energy of visible light.
It describes the effective radiation value of the light source, and the unit is 1m (lumen). The luminous flux of lamps with the same power may be completely different because of their different luminous effects. For example: general lighting bulbs are only 10 1m/watt, while metal halide lamps can reach 80 1m/watt.
4. Color temperature: Color temperature means that when the color emitted by a light source is the same as that radiated by a black body at a certain temperature, the temperature of the black body is called the color temperature of the light source, generally in Kelvin k. Such as 3200k and 5600k etc. When the color temperature is high, the light is cooler; when the color temperature is low, the light is warmer; when the color temperature is moderate, the light is close to white.
Under normal sunlight in nature, the color temperature of light is generally higher than that of artificial lamps. Under normal circumstances, the color temperature of sunlight is about 5600k, while the color temperature of studio and performance lamps is about 3200k. (hot light source).
However, the cold light source lighting that has recently emerged in TV studios is a change from traditional light sources. The cold light source has high color temperature, low energy consumption, and low heat generation. When taking indoor and outdoor photography, the color temperature conversion is simple and the picture is natural. Of course, the cold light source has higher performance requirements for the dimming console. 5. Channel: In modern light control, a new concept of channel has emerged.
It refers to a collection of control loops on a luminaire. Specifically, the functions of a lamp need to be controlled separately (for example: focus, strobe, color change, etc.), and the collective name of the output circuits of the dimming consoles it occupies is the channel. For example: the functions of a computer light include aperture, color, strobe, dimming, horizontal lens movement, and vertical movement, so they occupy 6 channels.
It can be seen from this that the concept of channels is still an evolution of the traditional lighting control circuit, but modern lighting is to bring together multiple channels on one device for unified control. Of course, the more advanced, more complex, and more actions the lamps take up, the more channels they may occupy, and the higher the requirements for the lighting console. For example: a dimming console with 108 light paths and digital output, if it wants to control computer lights with 12 channels, then it can only control 9 such lights at most, how to control is the problem of signal and address allocation up.