Are your eyes tired or hurt
because of insufficient light?

Lighting is a matter close to you that should not be overlooked.

          Inadequate light...is considered a cause of eye health problems. That may cause eye fatigue, eye pain, or eye pain, which is the beginning of Computer Vision Syndrome (Computer vision syndrome) due to having to sit and stare at a computer screen. or smartphone In areas where the light is not enough or too bright for a long period of time throughout the day Until it affects to cause fatigue in the eye area.

Why does bright light cause eye fatigue and pain?

1. The light is not bright enough. 

          Problems with insufficient lighting, such as a room with only one light installed installed in the wrong location or the brightness value is not suitable for work These problems cause us to focus our eyes too much. Including having to put your face so close to what you're looking at that it makes our eyes tired from the light of the screen. In the work room there should be sufficient light for use. So as not to cause eye fatigue.​

2. The light is too bright

          Lights that are too bright causing light to fall on Or what we call Glare light that can enter the eyes, such as light from a computer screen. Light from a light bulb without a filter. When the light is too bright or bright It affects the mood. and eye discomfort, causing eye fatigue, dry eyes, and irritation easily.

Choosing the right lighting for the room

          Lekise would like to recommend techniques for increasing lighting to suit your work. How to measure the brightness of a light bulb Many people may still misunderstand that wattage is the unit for measuring brightness (Watt) because in the early days of light bulb production We use the number of watts to compare the brightness of light bulbs (Watt = power consumption per unit of time: J/s) because it uses electrical power to produce brightness. But nowadays there is technology that makes each type of light bulb consume the same amount of electricity. (same wattage) but can produce different brightness values: lumens (Lumen) and lux (Lux).

What is the difference between Lumen and Lux?

Figure: Shows the relationship between the amount of different types of light.​

1. What is lumen?

          Lumens are a measure of the amount of light that comes out of a bulb each second. which will have a constant value Because no matter where we put the light The amount of light that comes out of the bulb will be the same. The lumen value is often compared with the power consumption (watts) to determine the luminous efficiency (lm/W). The lumen value per watt that comes out The higher the value. It will help save electricity.

Compare luminous efficiency values

LED T8 light bulb - PERFECT ECO has a luminous efficiency of 100 lm/w.
Calculated from this light bulb giving 900 lumens of light / power (power consumption) 9 watts.

T8 fluorescent light  have a luminous efficiency of 65 lm/w.
Calculated from this light bulb giving 1160 lumens of light / power (power consumption) 18 watts.

Tips: Take a look at the information on the box and then convert the Watt value to Lumen.​ Here

2. What is Lux?

          Lux is a unit of the amount of light or light intensity that falls on an area per square meter. This value does not indicate the light efficiency of the bulb. But it is a measurement of the brightness that hits the surface, with 1 Lux equal to 1 lumen per square meter. It is commonly used to calculate how much light this area needs. By simulating light in different directions according to the light distribution pattern of the lamp. Distance between bulb and working area And what is the intensity of the remaining light? Is it sufficient for use?

          When turning on 1 light bulb in the office room Then measure the amount of light. The area near the bulb will have a lot of light. But areas further from the bulb will have less light. Even if you choose a light bulb that produces the same number of lumens, But if installed in a lamp that has different light distribution characteristics This may cause the amount of light that falls on the area to be uneven. Therefore, lux is commonly used as a unit to measure the actual brightness in each area. which changes according to the distance from the lamp.

Substitute the value with the formula lx = lm / m2.

lx = Lux light intensity or brightness value
lm = Lumen, the amount of light from the light bulb.
m2 = square meter area

The lux value (lx) is equal to lumens (lm) per square meter. To put it simply.

           The amount of light is 1,000 Lumen. When measuring the area around the light bulb in a radius of 1 square meter, the light intensity on the surface can be 1,000 Lux, calculated according to the formula 1,000 lx = 1000 lm / 1 square meter.

           Conversely, if the amount of light is 1,000 Lumen in a radius of 10 square meters, the light intensity on the surface will be only 100 Lux, calculated according to the formula 100 lx = 1,000 lm / 10 square meters.

          You can download the Application: Lux Meter on your Smart Phone to measure light within the home. Although it is not as accurate as a direct light meter (Lux Meter), it can be used to measure brightness for use at home instead. The recommended Lux value for an office room is on average 300-500 Lux.

         For light bulb packaging boxes, there will be a lumen value (Lumen) specified on the box. When you go to buy one, you can look at the Lumen value alone. Because that indicates the brightness efficiency of that light bulb. But it's even better...if you can calculate the appropriate brightness value. To know how much Lumen you need to buy and how many bulbs to buy. To suit the area of use To reduce eye fatigue and eye pain while working and various activities. appropriately.

Tips: Take a look at the information on the box and then convert the Lux value to Lumen. Here

Arrange lighting to suit the work room.

          Creating an appropriate lighting environment for working It is considered another option to help reduce eye health problems. including choosing the type of light, lamp type, installation style The right amount of light To help increase the ability to see. and visual comfort for working.

          1. Use natural light to help

           Your work desk should be arranged so that natural light shines through. Because of that natural light It is the most comfortable and suitable light. For working during the day and prevents us from having to focus our eyes too much

           Your work desk should face natural light. If you're left-handed, natural light should shine on your right side. On the other hand, if you are right-handed, natural light should shine through on the left side. In order not to disturb the light during the working day

2. Use light bulbs to help organize the lighting in the room.

           The work room is considered the room where we spend the most time. It is also a room that requires a lot of eyesight. Therefore, we should arrange the lighting in the work room appropriately. This will be an important aid in maintaining eye health.

           Appropriate light intensity for the office room

           Brightness 300 - 500 Lx or a light bulb with a light amount of approximately 500 - 1,000 lm.

           Color tone

           Work rooms should use bright white lights (5,700 - 6,500 K) that are most similar to natural light. Helps you feel bright. The eyes can see well, comfortable on the eyes, and colors are not distorted. Because it doesn't make you feel hot. Low object color distortion and can be used for reading for long periods of time without causing eye fatigue.

Types of lighting commonly used in work rooms

1. Ambient light or surrounding light (Ambient Light/General Light)
   
              Ambient light is considered the basic lighting used in a room. It is the use of light in place of natural light by using a light source from a high place, such as
   
   Recessed ceiling lamps are commonly used: recessed downlights, recessed grid lamps, recessed acrylic lamps that can be used with T8 fluorescent lamps or T8 LED long light bulbs. The light from This type of lamp has the characteristics of spreading light at a wide angle, covering the space within the room in all directions. Provides light throughout the room. Ambient light will not emphasize beauty. But it will be used to focus on usage.

Picture: Recessed grille lamp Use with T8 fluorescent bulbs or T8 LED bulbs.

Picture: Acrylic ceiling lamp Use with T8 fluorescent bulbs or T8 LED bulbs.

Picture: Recessed downlight, LED SLIM DOWNLIGHT, EASYSLIDE model.

Picture: Recessed downlight lamp ULTRASLIM 3 LED SLIM DOWNLIGHT
 

• Floating ceiling lamps are commonly used as LED downlights, floating grid lamps, and floating acrylic lamps. That can be used with T8 fluorescent bulbs or T8 LED long bulbs, steamed bun lamps, and lamps hanging from the ceiling. (Chandeliers)

Picture: LED Ceiling light, Crystal slim model

Picture: Fabric recessed downlight, VEGA2 model, used with A60 Bulb.

Picture: DUOFIT downlight lamp can be used in both floating and ceiling applications.

2. Task light/spot light (Task Light)
   
              Task lighting is lighting that is designed to provide extremely bright light levels. And the light should be in a position that does not create dark shadows on the work area, such as work desk lighting. Designed to provide light for reading. or for working in front of the computer in order to be clearly visible, etc.
   
              The fact that our room has insufficient light You can use specific light to add brightness to that part. The most common types of lamps are:
   
               Floor Lamps, Desk Lamps are suitable for decorating bedrooms, living rooms, or offices. By letting the light spread only to a specific point. Therefore, it is designed to be able to adjust various angles so as not to cause dark shadows of your hands to block the light. This type of lamp It will help add light in places where the light from the ceiling can't reach or where the light in that area is not enough.

• Wall lamp or wall lamp (Wall Light, Wall Sconce)
  
             It is a lamp that focuses light on the wall and spreads out to the sides. The light hits the ceiling and floor. It will be a lamp that protrudes from the wall. Suitable for the dressing table. or in front of the area where the glass is attached It will help brighten the light without creating shadows on the face. Allows users to see details clearly.
  
   

Bright light hitting the eyes (Glare)

           For desks with display screens The lighting must be appropriate for the work that occurs with the activities on the desk, whether it be reading information on the display screen. Reading and writing on paper, typing, working on the keyboard, etc.

Picture: Position of light hitting the eyes

1. The light reflects off the eyes directly from the lamps used. from installation in an inappropriate position
2. The light reflects directly off the eyes by reflecting light from the floor of the desk. that is oily or shiny
3. The light reflects directly off the eyes from the reflection of the computer screen. or keyboard
4. The light reflects off the eyes directly from sunlight.
5. The reflection obscures the brightness on the screen.​

Picture: Example of obscured reflection

To correct glare, the brightness of the lamp must be limited to suit the display screen. And positioning needs to be taken into account.

1. Avoid tables or equipment with glossy or shiny surfaces to avoid glare that can be distracting.
2. The brightness of the lamp must be appropriately limited. not too bright Or install a lamp at the right height for the amount of light. Or you may use a lamp that has medium brightness but use several. Instead of using lamps that produce very high brightness Just one point
3. Avoid installing bare bulbs. It is recommended to install the bulbs together with lamps that have covers such as grille lamps or acrylic lamps. If it's a downlight, we recommend a downlight with a lens cover. To reduce glare and discomfort.
4. Adding light to the surrounding area Do not let there be too much difference in the amount of light. To reduce reflection on the surface
5. Adjust the position of the lamp installation point or adjust the work desk position To reduce reflected light reaching the eyes
6. The lamp should not be positioned in front. Light can be reflected and directed towards the eyes. Or install a lamp directly overhead. Because light can reflect onto the display screen.
7. Do not position your desk with the lamp behind it. This will result in a shadow being cast across the desk. and the computer screen area
8. Adjust brightness from the computer screen or smartphone to an appropriate level​

          From the example quoted above. In the case where the position of the lamp cannot be adjusted or moved And the office still has insufficient light, causing eye pain and eye irritation when sitting and working. Lekise recommends installing additional spot lights. that can adjust the direction of lighting To reduce the problem of light entering the eyes directly. And use only spot lighting lamps that can control the area of illumination or at a distance between 10-30 degrees, or you should move the table lamp. Keep away from the computer screen. Or point the lamp at the wall behind the screen. to make the light reflect wider It can help reduce shadows. And makes sitting and working more efficient, eyes less tired and more comfortable. Just this can reduce the problem of light entering the eyes directly.

Want to ask for more information about lighting?
Just you...talk to Lekise. We are ready to provide consultation services. Advice on selecting light bulbs that are appropriate for use.
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