ldg-2 .rendering made by dialux evo square downlight with trapezoid beam (right) round downlight

Download LdG-2 .Rendering made by DIALux evo Square downlight with Trapezoid beam (right) Round downlight

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  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 1

    LdG-2 Vertical Illuminance

    Introduction When I first started my career, I was told by many Engineers that light planning is only a matter of

    calculation the light on working plane which is in most cases around 0.8m from floor level, which means

    planning the light only for horizontal spaces!

    Later I found out in most cases that light beams and scallops are more visible on vertical not horizontal

    which would make vertical as important as horizontal if not more important!

    For this guide the calculation and rendering was mad by DIALux evo software which is available as a free

    software from www.DIALux.com

    Light shape what is called light scalloping is very visible on wall and makes the vertical surfaces very important

    during lighting design stage.

    This guide will help you plan the lighting by having proper offset to achieve

    1-Grazing light (light scalloping) by different beam and offset

    2- Uniform grazing light 3- Uniform wallwashing

    4-Accent for objects on wall

    Grazing (light scalloping)

    Grazing light might not be the best option but when it is made it should be made right without making odd

    shape and destroying the space by weird light scalloping.

    To avoid bad light scalloping first you should know the following:

    1-The difference between round and square downlight

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 2

    2- The beam angle of the luminaire

    3-The light distribution Quality (main beam and secondary beam)

    4- The effect of light with different offset from wall(distance from wall)

    5- The alignment of scallops with architectural lines.

    6- Intensity of lighting scallops 7-LED Downlight with scallops.

    The difference between round and square downlight The light scallop of a round downlight is different from a square downlight

    Trapezoid beam of a square downlight

    Cone beam of around

    downlight

    Rendering made by DIALux evo

    Square downlight with Trapezoid beam (right)

    Round downlight with Cone beam (left)

    It should be noted that downlight with lens will make the beam softer.

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 3

    Also a square downlight with round opening will have a cone beam

    The Trapezoid beam will be produced when the downlight opening is square not the housing or frame.

    Cone beam of round downlight Trapezoid beam of a square downlight

    The beam angle of the luminaire Different beam angle will have different scallop size on wall

    From right to left

    Narrow spot 5o

    Spot 14o

    Flood 28o

    Wide flood 45o

    The light distribution Quality (main beam and secondary beam) while many bad downlights or spotlights have lots of lines around the main beam angle there are

    good downlights that have soft beam edges

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 4

    Downlight with many lines for

    main and secondary beam

    Downlight with soft beam edge

    The beam and light distribution is produced by either lamp or Luminaire.

    A reflector lamp without any additional optical system has different effect that lamp with additional

    optical system.

    QR-CB 51(MR16) 50 watt 10o in a luminaire with additional Reflector

    QR-CB 51 (MR16) 50 watt 10o in a

    luminaire with trim only no reflector

    Additional Reflector could improve the beam quality and make the light distribution better as could

    be seen from above rendering after using the manufactures photometric data in I evo.

    It should be noted that usually the main purpose of a luminaire reflector is to prevent glare and

    improve the visual comfort, so it is not always you get better scalloping.

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 5

    Also using different reflector lamp with similar beam angle will produce completely different

    scalloping

    QR-51 50 W 12 V 10 GU5.3

    (MR 16)

    QR-111 50 W 12 V 6 G53

    (AR-111)

    Selecting the lamp and its optical system will make a big different scalloping result.

    It is always good to check the luminaire in real mock-up and use the correct photometric to get the

    same in reality.

    I have experienced many cases where engineers calculate from one manufacture and use

    specification of another one! , which could have completely different results.

    Lighting software like I will get accurate results only if right inputs are used and the most important

    parameter is selecting the right photometric.

    The effect of light with different offset from wall(distance from wall) The scallop size on wall will be affected also from the offset from wall (how far the center of

    luminaire from wall).

    Usually all offset when mentioned it means from center of luminaire, so in this Guide all offset are

    from center of luminaire to wall.

    The more offset from wall the lower the scallop from top of the wall as could be seen from bellow

    rendering.

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 6

    150 mm produce scallop close to top of wall

    500 mm produce scallop lower will less intensity than 150 mm offset

    To avoid having different scalloping size in one room it is good to keep the same offset from walls

    identical, having one offset from one wall different from another will make different scallops

    When offset are different (ab) then

    scallops are different as well

    Identical offset (a=b) have same scallops

    The corner downlight are @ 45o

    The alignment of scallops with architectural lines The lighting planner or lighting designer should understand the architectural space, if there is any

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 7

    lines , groves in the vertical then the lighting should be aligned to achieve good result, otherwise

    lighting could make scallops that not in line with architectural vertical lines

    The scallops are not aligned with

    architectural vertical lines

    The scallops are aligned with

    architectural vertical lines

    The scallops are aligned with

    architectural vertical lines

    The scallops are aligned with

    architectural vertical lines

    The scallops are not aligned with architectural vertical lines

    Intensity of lighting scallops The intensity of lighting scallops should not be high , using computer software like I could help the

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 8

    designer to make the right choice for the design.

    Soft scallops Strong scallops

    LED Downlight with scallops LED is an efficient lamp source that is expected to replace all conventional lamp sources soon,

    however there are very different quality of LED ranging from very poor to excellent LED when it

    comes to scallop shape and color, so it is strongly advisable to check the downlight in a real

    physical mock.

    One of the criteria is how different in color are the LEDs (the different of white light from one LED

    to another) which called MacAdam ellipse or SDCM (Standard Deviation Color Matching)

    The products used for the next guide from ERCO has less than 2 SDCM which means no color

    visible to human eye.

    4 Step MacAdam ellipse or

    SDCM is visible to human eye

    2- step MacAdam ellipse

    (SDCM) are not visible

    `

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 9

    The bad quality of scallop shape and the

    difference in color make LED very poor

    in architecture.

    A lot of difference in color SDCM >4 SDCM

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 10

    Physical mock up @ ERCO Mock Room

    Dubai Office (LED

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 11

    Spacing 500 mm

    Luminaire ERCO 87629

    Spacing 700 mm

    Luminaire ERCO 87634

    VIG-3 VIG-4

    Beam Food 27o

    Offset 300 mm

    Spacing 1000 mm

    Luminaire ERCO 87639

    Beam Wide Flood 50o

    Offset 400 mm

    Spacing 1000 mm

    Luminaire ERCO 87645

    VIG-5 VIG-6

    Beam 5o and 27o Beam 5o and 47o

  • LdG-2 Lighting design Guide for Vertical Surfaces Ezzat Baroudi

    ezzatbaroudi@yahoo.com 12

    Offset 150 mm

    Spacing 500 mm

    Luminaire ERCO 87629

    ERCO 87639 (Dimmed to

    15%)

    Offset 150 mm

    Spacing 750 mm

    Luminaire ERCO 87629

    ERCO 40014 (Dimmed to

    10%)

    Uniform grazing light Uniform Grazing is used to avoid the scalloping effect of light on wall and could be done perfectly

    with LED liner luminaire like ERCO Lightgap Luminaire.

    The luminaire in a cove of architecture in a continuous row.

    Uniform Grazing is perfect light for Textured wall.

    Uniform wallwashing Wallwashing is a technique that is makes the lighting design for a wall free from any