Bathroom Zones
There are 4 zones to bathroom lighting that need to be considered when fitting a bathroom as the regulations become much stricter.
- The inside of the bath or shower basin
- Area above bath or shower basin
- Within 0.6m of the edge of the bath or shower basin edge
- Outside zones 0, 1 & 2
CIBSE Lighting Levels
CIBSE – The Chartered Institute of Building Service Engineers
| Area | Lux |
| Offices | 500 |
| Small Retail Stores | 500 |
| Supermarkets | 750 |
| Hypermarket | 1000 |
| DIY Stores | 1000 |
| Showrooms | 500 – 750 |
| Changing Rooms and Toilets | 100 |
| Restaurants and Canteens | 200 |
| Food Prep Area | 500 |
| Entrance Halls | 200 |
| Enquiry Desks | 500 |
| Corridors and Stairs | 100 |
| Classrooms | 500 |
| Warehouse Picking Area | 300 – 350 |
| Warehouse Racking and Storage | 200 – 250 |
Corrosive Areas Defined
Corrosion Classes
The corrosion classes below describe – with examples – under which conditions treatments for iron and metal are providing sufficient corrosion protection.
| ISO 12944 | Impact | Interior | Exterior |
| C1 | Very Low | Heated buildings with clean air, such as offices, shops, schools, hotels, etc. | None |
| C2 | Low | Buildings not heated, where condensation may occur, such as warehouses and sports halls. | Atmosphere with low pollution. For example in the country. |
| C3 | Middle | Buildings for production with high atmospheric humidity and some air pollution such as food manufacturers, breweries, dairies and laundries. | Urban and industrial areas, moderate sulphur dioxide pollution. Coastal areas with low salt content. |
| C4 | High | Chemical manufacturers, swimming baths and ship and boatyards by the sea. | Industrial areas and coastal areas with moderate salt impact. |
| C5-I | Very High – industry | Buildings or areas with almost permanent condensation and with high pollution. | Industrial areas with high humidity and aggressive atmosphere. |
| C5-M | Very High | Buildings or areas with almost permanent condensation and with high pollution. | Coast and offshore areas with high salt content. |
Comment( DS Manual 124:2000)
Corrosion categories C1 og C2 do not exist in Denmark. Due to the prevailing wind conditions at the Danish west coast, corrosion category C5M may occur as far as 25 km inside the country.
IP Ratings and Colour Temperatures
IP Ratings Explained
An IP rating is a system which allows us to understand how well protected a light fitting is against various elements. It starts with the letters IP (Ingress Protection) meaning how well protected it is, followed by 2 digits.
The first digit indicates how secure a fitting is against solids such as larger airborne contaminates and dust. The second digit indicates the protection against liquids and moisture.
The lower the number following the IP, the less protection it has. The scale of numbers goes from 0-6 for the first digit and 0-8 on the second digit.
| First Digit Scale | Second Digit Scale | |
| Fixture completely unprotected | 0 | Fixture completely unprotected |
| Fixture protected against solid objects larger than 50mm | 1 | Protects against dripping water |
| Fixture protected against solid objects greater than 12mm dia | 2 | Protects against dripping water when tilted to 15 degrees |
| Fixture protected against solid objects with a minimum 2.5mm dia | 3 | Protects against spraying water when tilted to 60 degrees |
| Fixture protected against object 1mm dia or more | 4 | Protects against spray from all directions |
| Dust protected. Limited ingress of dust permitted. | 5 | Protected against jets of water. Limited ingress permitted. |
| Fixture completely dust proof | 6 | Protected against strong jets of water. Limited ingress permitted. |
| 7 | Protection against the effects of immersion in water be- tween 15cm and 1mtr for 30 mins. | |
| 8 | Protection against the effects of immersion in water under pressure for long periods. |
Colour Temperatures Explained
Colour temperatures in LED are measured comparative to a black body at a specific colour temperature in degrees kelvin (k).
| 2700k | Very warm white | Gives a warm and “tranquil” feel |
| 3000k | Warm white | Slightly whiter than a glow effect |
| 3500k | White | Standard colour for most fluorescent tubes |
| 4000k | Cool white | More illuminating white mainly used in offices |
| 6500k | Daylight | Sharp, crisp and cold colour for clinical use |
| 8000k | Skywhite | Specialised lighting with blue tones |
LED Definitions
CRI – Colour Rendering Index. This term indicates the colour shift that matters experience when lighted by a source of
light. The higher the CRI rating, the more natural and crisper the colour with reduced amount of glare.
DID – Direct Indirect. Light is cast upward and downwards from the fixture
DLOR – Downward Light Output Ratio. This is the LOR for the direct light only
Energy Efficiency – Energy efficiency is a measurement of a lowered consumption of energy whilst giving off the same light output
L70 – This denotes the percentage of lumen output following standard degradation e.g L70-30% degradation, L80-20%
degradation, L50-50% degradation and L90-10% degradation. L70 is most commonly used as the human eye
cannot detect reduction of light output until it has reduced by 30%
LED – Light Emitting Diode
LOR – Light Output Ratio. This is the measurement of light output when the fitting housing and diffusion is taken into
account
Lumens per Circuit Watt (LpcW) – Amount of lumen output per wattage. This is a division of the lumen output by the consumption of the fitting
LUX – The light level measured at any given distance from the luminaire. 1 lux = 1 lumen per m²
Primary Lumen Output – The output of a fitting before a cover goes on
RoHS Compliant – Restriction of Hazardous Substances
Secondary Lumen Output – The output of a fitting after a cover goes on
Self-Test Emergency – The self-test circuit is set to interrupt the mains supply at different intervals to initiate emergency lighting tests
T5/T8 – Relates to the size of the tube. T5 is 5/8” of an inch diameter. T8 are 1 inch diameter
UGR – Unified Glare Rating. UGR is a specific formula designed to establish the amount of glare a fitting gives off
Sensors
Corridor Function – Detects motion and dims down to 10% when no presence is detected
PIR – Passive Infra-Red. Detects motion through a disturbance in the infra-red signal
High Bay PIR – As above for fittings with a mounting height of 5 metres or more
Microwave – Detects sound wave
High Bay Microwave – As above for fittings with a mounting height of 5metres or mo
Photocell – Detects light levels and switches on and off accordingly
Sensor Loads
Inductive – Typically used for fluorescent
Resistive – Typically used for incandescent
These are the maximum total wattage a sensor can operate. For LED, allow 80% of the inductive total