The bright room, is it up to standard?

Greetings, how are you steemit friends? Glad to meet you again and hopefully healthy always. Today I will discuss the calculation of the number of lighting needs in the room, we often guess how many lamps are required in one room, whereas according to the standard, each room needs a different amount of lux. The architects will usually determine an exact composition of light in a room so that users stay comfortable for a long time.

Before electricity was discovered, humans used a candle as a source of light and other simple sources of light as lights during dark conditions, and the habit was eventually replaced by incandescent lights since a beginning of discovery by a well-known scientist to this day.

Lighting systems continue to evolve to date, ranging from the brightest, the most efficient, and the simplest. But what can be known from the lighting?

LUMENS
We recognize lumen as the total amount of light coming from the source, the lumen including the unit of the International System of Units, in its calculation 1 lumen/m² equals 1 lux.

Lumens can also be understood as dark and bright light, so the lighter the light equals the higher the lumen level it has.

LUX

Same with a lumen, lux including the unit othe International System of Units, a derivative used to measure the flux of light that is dispersed per square meter of space. So to measure a need for light in a room we will use a lux unit.

CANDELA
While the candela is the International System of Unit that serves to measure the strength of light from sources that produce monochromatic radiation at a frequency of 540 x 10¹². Or it could be called the light intensity generated from the source.

In 1979, General Conference on Weights and Measures (CGPM) defines candela as.

The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540×1012 hertz and that has a radiant intensity in that direction of 1/638 watt per steradian. ^source

Candela itself comes from the Latin meaning candle

What affects the lighting of a room?

1. Lumen lights
2. Spacious room
3. Color of room
4. Material type (ceiling, floor, wall, and furniture)

Does each room have standard lighting requirements?
Yes, of course, you need extra light when you are in the laboratory, as well as the bedroom, you do not need extra lighting unless you make your bedroom as a laboratory.

Bedrooms that have too bright lighting will make us a glare and make uncomfortable, as well as less-lit workspace will also interfere with comfort.

For example, we will determine how many lamps are needed in the bedroom according to the standard?

CALCULATION OF NEEDS

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We will calculate a need for lights in the bedroom with room size 5 x 5 meters using white wall paint and ceiling gypsum board. We use ordinary 30 Watt fluorescent lights, so how many lamps fit a standard required to illuminate a bedroom?

Keep in mind that a standard 1-watt lamp is equal to 75 lumens, and nowadays normally, a lamp manufacturer has determined the number of lumens on a type of lamp they produce.

Answer.
According to the standard, a bedroom in a residence has a standard lighting of 120-250 lux, so we just consider the requirement is 200 lux.

The formula we use.

N = (E x L x W)/(Ø x LLF x Cu x n)

Explanation.

Symbol	Information
N	Total lamp required
E	Powerful illumination
L	Space length
W	Width of space
Ø	Total lumens
LLF	Light Loss Factor which has a value of 0.7 - 0.8
Cu	Coefficient of Utilization
n	number of lights

Is known.

Symbol	Information
E	200 Lux
L	5 meters
W	5 meters
Ø	30 watts x 75 lumen = 2250 Lumen
Cu	50% or 0.5
LLF	0.7
n	1

Then the solution is

Symbol	Information
N	(200 LUX x 5 meters x 5 meters)/2250 Lumen x 0.7 x 0.5 x 1
N	5000/785.50
N	6,349 Amount (points) of light

In accordance with these calculations then the need for lighting in a bedroom with a size of 5 x 5 meters using standard 30 watts fluorescent light it takes 6 to 7 lights.

What about other type lights? Currently, you can easily find LED type lights, this type of light is considered more energy efficient.

I found the reference to a LED lighting product (I can not mention a particular brand)

Watt	lumens
4 watt	350 Lumen
7 Watt	600 Lumen
14 Watt	1400 Lumen
Etc...	-

So by knowing the standard and how the calculation as above then you can adjust a type of light you will install and how many lights are needed in the room that you plan, a higher the lumen of a lamp, a less number of lamps needed to fulfill the lighting standards of a space.

^{Currently LED lights are considered to be more energy-efficient than regular incandescent lamps.. Image source wikipedia}

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CONCLUSION

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Humans need lighting to help vision during dark conditions, one of them is a lamp, a lamp with electrical energy is currently commonly used in almost every home.

The light of a room itself affects a comfort of a user while on the move in the room, the architects have to able to determine a brightness of a room so that the user comfortable activities.

A room that is too bright also does not determine whether the room is good for health or even disturb a health and comfort level, as well as a room that has less lighting.

The engineers finally set the standard lighting requirements of a room that can be tolerated so that users remain comfortable using it.

In accordance with the above calculation example, then you can determine how many lights are needed in a room that you plan, a calculation of light needs above is just an example and can be adjusted to the needs of a field.

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This is the only thing I can write on this occasion, over all the mistakes and lack of unintentional writing as a servant of God, I apologize.

Thanks to friends who have visited this blog and provided constructive comments, as well as scientists who are willing to sacrifice their time for a better civilization.

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Active link reference:
www.wikipedia.org
www.wikipedia.org
www.wikipedia.org
www.slideshare.net
www.slideplayer.info

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BEST REGARDS @kharrazi