In the last passage of Why Lumen Of Per Watt Is Different From Lights, we can learn that the lumen of an incandescent lamp is about 10~15 lm/W, the lumen of a fluorescent lamp is about 40~60lm/W, the lumen of LED light is about 80~100lm/W. Expect that the emitting medium can affect the lumen brightness, but the resistance category and the components will also influence the lamp's brightness.
In our daily life under the lighting environment, our eyes health related to the lumen indicates. Generally, our human eyes need 1000~1400 lumens to see clearly, if too much light exposure will result in glare which hampers our ability to see clearly. And the human eye can not see anything under 0.1 lumens per square meter, so if we want to have visible light in darkness where need to light up 1 lumen of light. When reading a book, lighting 300 lumens to 450 lumens each square meter during the white day is fit for our eyes, and lighting 500 lumens to 600 lumens each square meter during the night is the best for reading. Otherwise, it will create glare harming human eyes. According to information of that LED lights emit 80~100 lm/W, 4 wattages or 5 wattages LED lamp applied for each square meter is reasonable. In the same way, a 30 square meter book room installs 5 LED lamps of 30 wattages is suitable.
How Many Wattage LED Light Install In Other Sizes?
The brightness level depends on the use function of the room, such as the warehouse and supermall need more brightness, a bedroom or other relaxed place just light warmly and enough to see is ok. The brightness of a room is not only relative to the wattages, but also relates to luminance, uniformity, and maintenance factor, etc. According to the GB50034 standard, the choice of the wattage of LED can take a reference as below sheets(two samples):
The standard lighting values of library buildings shall comply with the provisions of Table 5.3.1
Sheet5.3.1 Library building lighting standard value
|
A room or place |
Reference plane and its height |
Standard lighting value (LX) |
UGR |
Uo |
Ra
|
|---|---|---|---|---|---|
|
General reading room |
0.75m horizontal plane |
300 |
19 |
0.60 |
80 |
|
Multimedia reading Room |
0.75m horizontal plane |
300 |
19 |
0.70 |
80 |
|
Elderly reading room |
0.75m horizontal plane |
500 |
19 |
0.60 |
80 |
|
Rare Books Reading Room |
0.75m horizontal plane |
500 |
19 |
0.60 |
80 |
|
Show room, catalog room |
0.75m horizontal plane |
300 |
19 |
0.60 |
80 |
|
archival repository |
0.75m horizontal plane |
200 |
19 |
0.60 |
80 |
|
Stack room |
0.25m horizontal plane |
50 |
--- |
0.40 |
80 |
|
Working room |
0.75m horizontal plane |
300 |
19 |
0.60 |
80 |
|
Collection, editing, repair time |
0.75m horizontal plane |
500 |
19 |
0.60 |
80 |
The standard value of office building lighting shall comply with the provisions in Table 5.3.2.
Table 5.3.2 Standard lighting values of office buildings
|
A room or place |
Reference plane and its height |
Standard lighting value (LX) |
UGR |
Uo |
Ra
|
|---|---|---|---|---|---|
|
Normal office |
0.75m horizontal plane |
300 |
19 |
0.60 |
80 |
|
High end office |
0.75m horizontal plane |
500 |
19 |
0.60 |
80 |
|
Meeting room |
0.75m horizontal plane |
300 |
19 |
0.60 |
80 |
|
Vedio meeting room |
0.75m horizontal plane |
750 |
19 |
0.60 |
80 |
|
Received room |
0.75m horizontal plane |
200 |
-- |
0.40 |
80 |
|
Service room |
0.75m horizontal plane |
300 |
22 |
0.40 |
80 |
|
Design room |
0.75m horizontal plane |
500 |
19 |
0.60 |
80 |
|
File room |
0.75m horizontal plane |
300 |
-- |
0.40 |
80 |
|
Data storage Room |
0.75m horizontal plane |
200 |
-- |
0.40 |
80 |
Reviewing the standard lighting values of the published building, we can learn that we can pick the suitable wattage LED light to mount on a certain horizontal plane on the base of the standard lighting value. For example:
Video meeting room: Picking 8 wattage LED lamp for each square meter
General reading room: 3 wattages LED lamp for each square meter
Design room: 4 wattages LED lamp for each square meter
For more LED reading lamp detail recommendation please follow this product link:
https://www.upshine.com/products/led-freestanding-luminaire/
