The Light Output Guide provides an understanding of:
The reason this is such a confusing concept is that lumens and watts measure different things.
Lumens (indicated by lm) are a measurement of the total amount of visible light to the human eye from a light source. The higher the lumen rating, the brighter the luminaire will be.
Watts is a measurement of the energy used to power the luminaire. The higher the bulb wattage, the less efficient the bulb is in conserving energy.
In simple terms:
We recommend that the office room is bright enough that employees can be productive and perform simple tasks. The number of lumens needed for each light will depend on the size of the office.
On average, office lighting requires around 700 lumens per square meter. That means that every 6’×6′ cubicle requires at least the same amount of light you would receive from a 35-watt incandescent light bulb. Focused lighting should be dedicated by task lamps around (700 -1200lm)
Environment | Lux |
|---|---|
Hospital Theatre | 1,000
|
Supermarket, Sports Hall | 750
|
Factory, Workshop | 750
|
Office, Show Rooms | 500
|
Laboratories, Kitchens | 500
|
Warehouse Loading Bays | 300 – 400
|
School Classroom | 250
|
University Lecture Hall | 250
|
Lobbies, Public Corridors, | 200 |
Stairwells | 200 |
Warehouse Aisles | 100 – 200 |
Homes, Theatres | 150 |
Family Living Room | 50 |
An efficacy rating is a measure of how much light a luminaire produces for the energy put into it. The higher the efficacy ratio, the more efficiently your product is performing. An LED can use up to 90% of its energy input to produce light whilst the remaining 10% converts to heat.
Think of this as similar to miles-per-gallon in a car, as a higher lm/W means higher efficiency and lower running costs, getting the most out of your fuel compared to similar but less efficient car engines.
LED lights are an extremely efficient light source. They use much less power to produce the same brightness when compared to traditional lighting. If you are still using old bulbs & you change to LED you could reduce you energy bill by 90%.
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