How to Choose a Lamp

The color temperature of the lamp influence the impression of visual comfort of the eye.

The EN 12464-1 standard leaves some discretion as to the choice of the color temperature of the lamps.

The color of a fluorescent lamp temperature is indicated on the lamp or in the catalogue of the manufacturers.

In practice, we choose:

  • Cold hues (Tc = 4 000 K) in the work rooms where lights are used during the day, in addition to natural light.
  • Hot for the lighting of dwellings or similar shades.
  • Cold hues for high illuminances or in hot climates.
  • Shades of color very cold (> 5 000 K color temperature), also called “light of day” in the blind premises.Indeed, close to natural light, they have a favourable effect on the well-being of the occupants.

It is necessary to avoid the simultaneous use of cold hues and warm hues, what bothers the chromatic adaptation of the eye and creates visual disturbances. So, when the premises have an important contribution to natural light, the trend will be to choose a higher color temperature to avoid too big differences between the artificial and natural lighting.

In premises where there is no supply of natural light, dynamic light can simulate the hue of the light of day (evolves during the day).

The light spectrum

The fluorescent tubes are a very wide range in terms of temperature and color rendering, as well as in terms of the light spectrum. Manufacturers return to type of application of their lamps in their catalog. This allows to check if the realized choice corresponds to its own situation. For example, there are lamps for slaughter which are intended to enhance the red color of meat.

Choice based on energy efficiency and cost

All lamps are not equal from the point of view of the’ efficiency and “functional” (duration of life medium, useful,…). The choice between the various types also depend on the cost of installation, i.e. the investment (such as table lamps and vintage lighting), consumption of maintenance costs of life and the number of ignitions/authorized extinctions. Indeed, he does not choose a lamp effective, but priceless.

Choice according to the ambient temperature of the room

The calculation of the performance of a lamp is at optimum temperature. This is particularly important in the choice between T8 and T5 lamps, for example. Knowing that the T5 reach their maximum light output at 35 ° C of room temperature and T8 at 25 ° C, it is difficult to determine what type of lamp is preferred. Indeed, as the real value of the ambient temperature is more around 25 ° C or 35 ° C light output drops 10% for one or the other lamp types.

Regarding the LEDs, they are very sensitive to temperature. It is the junction temperature prevailing. The temperature of the junction is low, the better is its luminous efficiency. In other words, in cold environments as cold food or in unheated premises applications, an LED lighting system works well.

Gallery

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