Lumitron Lighting Reflectance Lumitron Lighting Compliance

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Lumitron Lighting Reflectance Lumitron Lighting Compliance
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Lighting Reflectance -  Lumitron Lighting Compliance

Lighting Reflectance & Lighting Compliance

The reflectance of a surface can dramatically alter both the levels achieved in an area and more importantly the likelihood of LG7 compliance.

The result of applying arbitrary figures can often be that the areas appear excessively ‘bright’ or surprisingly ‘dark’.

In table 1.0 below we have used a standard type recessed luminaire with an LOR of 65%. This is representative of many fittings in use today.

This table has a dual purpose since it shows that if the ‘typical’ or ‘assumed’ reflectances were applied as opposed to the real percentages, then not only are the levels achieved distorted but also if the client is seeking LG7 compliance, there is a temptation to ‘pour’ more light onto the walls by the use of wall washing downlights.

These, whilst beneficial if applied correctly, can if viewed against a ‘brighter’ than anticipated surface, appear overpowering.

Figure 1.0

This scheme illustrates the problem with reflectances and their effects on LG7 compliance. Based on information to hand (70%, 50%, 20% reflectances) the scheme theoretically needed additional wallwash downlights to supplement the wall and ceiling levels.

In reality the reflectances were 82%, 81% and 23% for ceiling, wall and floor respectively.

Figure 2.0 (Shown right)

At proposal stage this scheme was deemed to fail to meet LG7. The client accepted this and after discussion decided against supplementary wallwash downlights, instead preferring to sell the building on its merits.

When designed initially with 70%, 50% and 20% reflectances the scheme showed levels of 435lux average, 43% walls / working plane and 20% ceiling / working plane.

After attending site with Dulux® colour swatches we determined the real reflectance values. Without going into detail, the scheme now fully complies with LG7 and the maintained levels are well over 500lux.

Ceiling

70% = Typical lighting industry ceiling reflectance
80% = Notional reflectance assumed where it is known that the reflectance factor is greater than 70%
86% = RAL 9010 20% gloss ceiling

Wall

50% = Typical lighting industry wall reflectance
70% = Notional reflectance assumed where it is known that the reflectance factor is greater than 50%
83% = Actual reflectance of Magnolia colour paint in matt (Dulux®)

Floor

20% = Typical industry floor reflectance
10% = Notional reflectance of a floor based on assumption that floor finishes are very dark
30% = Actual reflectance of a light coloured carpet
 

Lighting compliance details

 

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Technical information associated with:
Lumitron Lighting Reflectance & Compliance

Luminaire compliance
Fig 2.0 (Left)

Luminaire reflectance

Commercial Office Light Fittings and Industrial Light Fittings

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Lumitron Lighting
Unit 31
The Metro Centre
Tolpits Lane
Watford
Hertfordshire
WD18 9UD

Tel: 01923 226222
Fax: 01923 211300

Office lighting controls

 

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Lumitron Lighting Reflectance Lumitron Lighting Compliance

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