Types of Lamps

Local time of occupation extended

As its name suggests, this type of local hosts occupants during a long enough to consider a choice of lamps that do not support too short operating times and frequent power on/off cycles.Indeed, they need some time to warm up and stabilize their luminous flux. Finally, the frequent power on/off cycles reduce their life.

It will point to places such as offices, the classroom, meeting rooms, sports halls…

For extended operating time with a limited number of ignition extinction cycle, the following lamps are suitable:

  • fluorescent lamps;
  • iodide and metal halide lamps;
  • HP sodium vapor lamps;
  • vintage lamps as listed on listofledlights

Local time of sporadic occupancy

There are facilities such as archives, technical areas… For this type of local, virtually all energy efficient light sources agree since the number of ignition and extinction is low during the time.This observation is also based on the fact that these offices have no access to natural light and don’t require light sources “dimmable”. In this case, it will be the financial aspect that will prevail.

Premises where the ignition and extinction of lighting are frequent

Are grouped here all traffic and washrooms. For a significant number of ignition and extinction, the electronic ballast fluorescent lamps and LEDs are ideal.

According to the IRC and the color temperature choices

The color rendering

For tasks where the color recognition is important, it will take into account the parameter of color rendering. In shops, this feature (quality of the produced light) is very important and can be satisfied with the use of effective products (other than incandescent)! In other parts, like the traffic, this data will be less important.

The EN 12464-1 standard sets, for each task or local, an color rendering index (IRC or Ra).

The purchase price often dominates at the choice of the fluorescent tube, choice which is done so without too much considering the color rendering.

Tubes called “standards” (type 29, 33, 129, 133, 20 or 30 = old codes – or 640,630.. .According to brands) are significantly cheaper to purchase that the tubes ‘type’ 830 or 840. However, they have two disadvantages:

  • anIRC or index Ra reduced, often psychologically incompatible with office work, but sufficient for circulation (IRC class 3 (IRC between 40 and 60));
  • A lowerlight efficiency .

The standard tubes will be avoid. In practice, you can choose standard lamps 830-840 in all situations. This standardizes the atmospheres and easier maintenance.

In contrast, higher color rendering (CRI > 90) lamps are reserved for stores fashion, museums, laboratories or industries where color fidelity is paramount. These lamps are considerably more expensive and usually have poor luminous efficiency.

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