Luminous intensity expressed in Candles (cd). Indicates the intensity of the light radiated by a lamp in a given direction. Duration expressed in hours indicates the number of hours of operation after which, in a given batch of lamps and in well-defined test conditions, 50% of the lamps cease to function.
Color temperature expressed in degrees Kelvin (° K). Indicates the tone of the light emitted by a lamp. On the market we find lamps with different shades of white, warm with shades of yellow, neutral, and cold with shades of blue used in Stage Lighting Sydney.
Color rendering index (Ra). It varies between 0 and 100, and indicates to what extent the colors perceived under an artificial lighting approach the real colors. The closer this index is to 100, the more the light source allows the appreciation of color shades.
Luminous efficiency (lm/W). It gives an idea of the amount of electricity absorbed transformed into light. It represents the ratio between the luminous flux emitted by the lamp (expressed in Lumen) and the electric power that feeds it (expressed in Watts). It is indicated with the lm/W symbol. It is a very important parameter for choosing the most suitable light source to save energy for Stage Lighting Sydney.
Expresses the amount of light energy emitted by the lamp in the unit of time. Illumination expressed in Lux (lx). Indicates the amount of luminous flux that hits a unit of surface. A Lumen on an area of 1m2 corresponds to 1Lux.
Replacing halogen lamps with LEDs
Replacing halogen or incandescent lamps with LED ones, represents a very useful solution that allows to obtain different advantages in terms of energy saving. The bulbs are primarily electrical devices designed to produce light and are classified according to the voltage (V) and the power absorbed by the network, expressed in Watts (W). The lumens instead express the degree of brightness emitted by the lamp.
The ratio between the visible light energy emitted and the absorbed electrical energy is defined as luminous efficiency. Part of the energy produced is lost, dissipated as heat or emitted light not visible to the human eye (eg infrared or ultraviolet light).
Based on the type of technology used, we mainly distinguish 4 types of bulbs: incandescent, fluorescent, halogen and LED. Let’s see the main characteristics of the various types of lamps and why it is good to replace the halogen lamps with LEDs.
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