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A luminaire guides, filters or transforms the light of a lamp.

A luminaire guides, filters or transforms the light of a lamp. Its main components are the frame, reflector, shields and diffuser plate. The choice of the luminaire is primordial to : optimize the light from the lamp; avoid glare problem;

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A luminaire guides, filters or transforms the light of a lamp.

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  1. A luminaire guides, filters or transforms the light of a lamp. Its main components are the frame, reflector, shields and diffuser plate. The choice of the luminaire is primordial to : optimize the light from the lamp; avoid glare problem; When you choose your luminary you have to take into account : The photometric parameters : • Efficiency • Angle of travel • Protection against glare • Light distribution • Maximum and average illuminance. Mechanic : protection against external body and for human body Electro-technic : connection to ground, insulation, certification Aesthetic : apparently, suspended,… Maintenance factor : decrease of luminary efficiency Luminaries Sources: Architecture et Climat

  2. Luminaires Composition luminary The frame permit to assembly the different components of the luminaire. The reflector reflect and direct the light emit by the lamp. Shields protect eyes from glare and avoid the direct view of the lamp. The diffuser sometimes replace the shields and protect the lamp from the ambiance. The plate is a device used to fixe auxiliaries (ballast, starter,…) frame shields reflector plate diffuser Sources: Architecture et Climat

  3. Luminaires Choice of luminary. 2.1. Photometric aspect Efficiency is the ratio between the flux emitted by the luminaire and the luminous flux of lamps (LOR : light output ratio) Angle of travel is the angle at which the bare source can not be seen by the observer. Shields number and form influence this angle. Glare may be direct (view of the source) or indirect (reflection of light on a surface to the eye of observer) Light distribution depends of the reflector and lamps positions. There are 3 kind of distribution : • Extensive : large curve and uniform light • Intensive : smaller curve and directive light • Asymmetric : non-uniform light (for example useful to light a blackboard) Average luminance represents the brightness of the luminaire (cd/m²), it can be the origin of glare. Photometric characteristics of materials : the color and the specularity of the materials influence the reflection of light on the luminaire Sources : M Bodart, J. Chabaudie, A. Liébard, A. De Herde, Guide de l'architecture bioclimatique, cours fondamental : Tome 5. Construire avec l'éclairage naturel et artificiel, Système solaires : l'observateur des énergies renouvelables, Paris, 2003 Sources: Architecture et Climat

  4. IK00 no protection IK01 0,15 Joule IK02 0,2 J IK03 0,35 J IK04 0,5 J IK05 0,7 J IK06 1 J IK07 2 J IK08 5 J IK09 10 J IK10 20 J Luminaires 2.2. Mechanic characteristic Protection against external body : Protection against electrical choc Bumper balls Chemical attack Protection of body and surroundings Explosion proof Anti-breakage Flammability : there is a label to classify luminaire that can be install on flammable surface or not. Protection against electrical choc Chemical attack Bumper balls Sources: Architecture et Climat

  5. Luminaires 2.3. Electro-technical aspect Assembly The choice of auxiliary have to ensure the operation of the lamp Assembly of electrical components have to ensure the electrical safety assembly Ground connection Class 0 : forbidden in some European country Class I: accessible metal parts connected to the ground, security ensure by the quality ground loop and differential breaker. Class II : basic insulation + additional insulation or reinforced Class III : SELV supply (separated extra low voltage) Labelling CE : product complies with security requirements ENEC : product complies with EN 60598 Class I Class II Class III Sources: Architecture et Climat

  6. Luminaries 2.3. Aesthetic aspect Luminaries can be : Apparently Built-in Suspended On foot On rail Wall light Fill light

  7. Luminaries 2.4. Maintenance aspect Decrease of luminary efficiency can provide from Decrease of luminous flux of the lamp around 15-20% at the end of lamp life (or even 30% on standard incandescent lamps). Decrease of the efficiency of the luminaire, due to dust and yellowing of the optics (reflectors and diffusers) and sources Decrease of the reflection coefficient of the local (wall, furniture,…) : after 1 yearloss of 10 to 15 %. There are twotypes of maintenance : the curative and preventive maintenance The curative : replacement of defective lamps and electrical equipment failure Thepreventive : cleaning light fixtures and lamps and replacement lamps before the end of their useful life (large facilities - similar lamps). When sizing a project : You must take into account the maintenance factor by oversizing the installation. Configuration A :no cleaning Configuration B : cleaningeverytwoyears Configuration C : cleaningluminarieseverytwoyears + cleaning local wallsevery 6 years B. Roisin, A. Deneyer, M. Bodart, P.D’Herdt, B. Deroisy, Guide pratique et technique à l’éclairage des logements, Architecture et Climat, UCL, Division Energie et Climat, CSTC, availablesoon Sources: Architecture et Climat

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