| Q1: Is it that the wattage of a lamp tells its brightness? |
A1: No, wattage tells the energy consumption of a lamp NOT its
brightness. It tells only how much you have to pay the energy bill. |
| Q2: What tells the brightness of a lamp? |
A2: Brightness of a lamp are measured in lumen |
| Q3: Why do I need a desk lamp for reading while the room has a ceiling
lamp of higher brightness? |
A3: This is because illumination level on your reading material is not
sufficient without your desk lamp that is much closer to your reading
lines and illuminate better your lines. Distance attenuates brightness
from the source and therefore the ceiling lamp illuminate less your lines
than the desk lamp. |
| Q4: What measurement units being used to tell the illumination
level? |
A4: Illumination level is measured in lumen per squared meter, abbreviated
as Lm/m2 or lux |
| Q5: What is the technical definition of illumination level? |
A5: It is the luminous flux per unit area, in another way to say,
it is the lumen received per each square meter at a specified surface. |
| Q6: Some examples of required illumination level in lighting design? |
A6: Here are some usual levels:
- Home Bedroom: 50 lux
- Home Bathroom: 100 lux
- Home kitchen: 300 lux
- Hotel Living Room: 300 lux
- Hotel Dining Room: 200 lux
- Hotel Kitchen: 500 lux
- Shops & Supermarkets: 350-750 lux
- School Classroom: 300 lux
- School Library: 500 lux
- Business Office: 300-500 lux
- Meeting Room:300-500 lux
- Drafting Room: 750-1000 lux
|
| Q7: How colour of fluorescent lamps are designated ? |
A7: Colour are scientifically designated by K degrees (Kelvin degrees).
The classification of descriptive name are as in the table below:
| Colour Temperature |
Descriptive Name |
Symbol |
| 6500K |
Daylight |
RR |
| 5000K |
Neutral White |
RZ |
| 4000K |
Cool White |
RL |
| 3500K |
White |
RB |
| 3000K |
Warm White |
RN |
| 2700K |
Incandescent Colour |
RD |
|
