Light Learning Zone

Lighting Abbreviations

Colour Temperature Guide


COLOUR RENDERING INDEX (CRI)
IP RATINGS


A measure of the ability of a light source to reproduce the colours of various objects. A light source with a CRI of 100 (Ra) would be perfect and balanced in terms of colour reproduction, shading and contrast.
Ingress Protection (IP) is a value given to products that have particular protection against dust and/ or moisture. The IP number is split, the first digit represents the level of protection against dust particles while the second digit represents the protection against moisture. For example IP00 has no protection against dust or moisture whilst a product with IP68 is dust tight and submersible up to 2m. 


LUMEN DEPRECIATION (L70)
LENI (LIGHT ENERGY NUMERIC INDICATOR)


Lumen depreciation values reflect the overall performance of a light source through its life. All light sources suffer from lumen depreciation, which can be accelerated by poor thermal conditions, over voltage or incorrect application. L70 is the operating time (hours) until the LED lumen output is depreciated to 70% of its initial lumens. 
LENI is a measurement of the buildings energy performance in energy usage per sq/m. For more information, visit www.thelia.org.uk 


The colour temperature of a light source is measured in degrees Kelvin. Below is a Kelvin temperature scale with examples of how colour temperature is used within different lighting applications.


Light Intensity Guide


Lighting In Bathrooms

Fitting lights in to bathroom is not as simple as some may think. Safety is a big part of the planning process and certainly should not be taken lightly.

The building regulations are in place to ensure that you and your family are safe whilst showering and or using the bathroom generally. This is why the building regulations have separated a typical bathroom layout in to zones and classified light fittings after these zones so that the consumer can easily understand what light fitting can go in what area of a bathroom.

IEE Wiring Regulations, BS 7671: 2008, Section 701 gives requirements for areas containing a bath or shower. This document should be consulted before installation of appliances.

Areas of the bathroom are split into zones. As a guide only, the requirements for luminaries in each zone may be summarised as follows. Particular care should also be taken with wash basins guidance for these are also contained within BS 7671.

Zone 0 = Refers to the interior of the bath or shower that can hold water. Requires electrical products to be low voltage (max 12V) and rated IPX7.

Zone 1 = Refers to the area above the bath or shower up to a height of 2.25 metres and requires a minimum rating of IPX4 (splash-proof), plus RCD protection. IPX5 should be considered if water jets may be present i.e. for cleaning purposes.

Zone 2 = Covers an area 0.6 metres wide immediately next to, and all around Zone 1. Wash basins should also be treated as Zone 2. The minimum rating here is IPX4.

First Numeral   

Short Description


Second Numeral

Short Description

 





0

Non Protected


0

Non Protected

1

Protected against solid objects greater than 50mm


1

Protected against dripping water

2

Protected against solid objects greater than 12mm


2

Protected against dripping water when tilted up to 15deg

3

Protected against solid objects greater than 2.5mm


3

Protected against spraying water

4

Protected against solid objects greater than 1.0mm


4

Protected against splashing water

5

Dust Protected


5

Protected against water jets

6

Dust Tight


6

Protected against heavy seas

 



7

Protected against the effects if immersion

 



8

Protected against submersion

Our ranges of lights for bathrooms are designed to ensure they give protection for the zone they are manufactured for. So regardless if you are looking for a bathroom mirror light or a zone 1 shower light we have the correct protect and will happily help you select the correct product of you are unsure.


CIBSE recommended light levels 

Area typeRecommended LUX


Public areas with dark surroundings10 - 50 Lux


Simple orientation for short visits100 - 150 Lux


Warehouse racking150 Lux


Warehouses, homes, theatres150 - 200 Lux 


Simple office work and classrooms300 - 500 Lux


Brighter areas such as bathrooms150 - 200 Lux


Normal office work with computers300 - 500 Lux


Supermarkets and workshops500 - 1000 Lux