1, brightness:
Brightness is defined around a surface at a point of unit area in a given direction, the light emitting intensity divided by the unit projection to the same direction on the area, unit : CD / C square meters. In the lighting system are not normally encountered brightness concept.
2, illuminance:
Illuminance is defined in a surface of the luminous flux density, it is in the unit area of the flux, the unit is LX.
The illumination of the definition and measurement is more complicated, as the mean cylindrical illuminance, equivalent sphere illuminance, scalar illuminance, their measurement conditions and calculation method for different. In the construction and decoration works are often encountered in the lighting system, occasionally also relates to the concept of illumination.
In 3, the luminous flux:
The luminous flux is a light source in the unit time off into the surrounding space radiation, can cause visual reaction energy, can see the light energy. It is described in the light of effective radiation value, the unit is 1m ( lumen).
The same power lamp luminous flux may be totally different, this is because their light effect different reason. For example: general lighting bulbs only 101m / W, metal halide lamps can reach 801m / W.
4, color temperature:
Color refers to the color and the blackbody source at a given temperature radiation light hue at the same time, the blackbody temperature called the source color temperature, generally by Kelvin K unit. For example,3200K and5600k etc..
Color temperature is high, the light color slants cold: low color temperature, light color: color temperature is moderate, warmer light close to white.
The nature of normal sunshine, the temperature of the light are generally higher than artificial lamp color temperature. Typically, the sun 's color temperature is about 5600k, and studio performances by lamp color temperature is around 3200k. ( heat source ).
But recently the rise of television studio cold light source lighting, is the traditional source of change. Cold light of high color temperature, low energy consumption, low heat, in the indoor and outdoor photography, color temperature converting simple picture of nature, of course, a cold light source on the optical bench performance requirement is higher.
In 5, channel:
In modern optical control, new produces a channel concept. It refers to the control loop in a lamp on a set. In particular: a lamp with the function needs to be individually controlled ( such as: focusing, strobe, discoloration ), and holds the lighting console output circuit collectively is channel.
For example: a computer lights function has an aperture, color, flicker, light, lens horizontal movement, vertical movement, as they occupied channel6. Can see from this, the concept of traditional channel or lighting control circuit evolved, but modern lamp is a plurality of channels together in a unified control device.
Of course, the more advanced lighting, more complex, more action, occupied channel number may be more to the lighting console, the higher requirements. For example: a108 optical path, with the digital output of the dimmer, it wants to control has 12 channels of computer lights, so it can only control9 of the lamps, how to control signals and address assignment problem.
