Luminous intensity, the quantity of visible light that is emitted in unit time per unit solid angle. The unit for the quantity of light flowing from a source in any one second (the luminous power, or luminous flux) is called the lumen. The lumen is evaluated with reference to visual sensation.

The horizontal axis is wavelength in nm. Integrating sphere used for measuring the luminous flux of a light source….Table of comparative luminous flux of several light sources.

Source	Luminous flux (lumens)
100 W incandescent lamp	1750
40 W fluorescent lamp	2800

For every watt our sun puts out, it produces 93 lumens of visible light. So at earth’s orbit, for each square meter, our sun puts out 127,000 lumens. That is very bright.

Basically the lumens is the unit radiated from luminous flux! They are measure of total amount of visible light to the human eye from a light source or lamp….Also Read: Aims of Good Lighting in a House!

Rooms	Lumens
Reading area	400
Hallway	300

The luminous flux indicates how much light is emitted by a light source. This refers to all visible light emitted by the LED lamp in all directions. The physical unit for the luminous flux is called lumen and is abbreviated to lm. The reason for this are different components within different LED lamps.

The lux (symbol: lx) is the SI derived unit of illuminance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.

A measurement of 1 lux is equal to the illumination of a one metre square surface that is one metre away from a single candle. The diagram below helps to visualise this more easily….Definition of Lux.

Natural Light Condition	Typical Lux
Sunset & Sunrise	400
Moonlight (Full moon)	1
Night (No moon)	< 0.01

1 lux equals 1 Lumen/m2, in other words – light intensity in a specific area. Lux is used to measure the amount of light output in a given area. One lux is equal to one lumen per square meter. We use lux because it is an efficient measurement for determining what we see as the brightness of a beam.

10,000 Lux Always A unit of illumination, equivalent to 0.0929 foot-candle and equal to the illumination produced by luminous flux of one lumen falling perpendicularly on a surface one meter square. Symbol: LX. Also called meter-candle.

Nevertheless, ophthalmologic evaluation every few years may be a reasonable precaution. Side effects of light therapy overdose may include agitation, headache, or nausea. Insomnia, particularly initial insomnia, may also be encountered.

Earlier it was common with light levels in the range 100 – 300 lux for normal activities. Today the light level is more common in the range 500 – 1000 lux – depending on activity. For precision and detailed works, the light level may even approach 1500 – 2000 lux.

840 lumens

LED equivalents to traditional incandescent light bulbs

Incandescent Light Bulb Wattage	LED Equivalent Wattage
100 Watt	10 Watt
75 Watt	7.5 Watt
60 Watt	6 Watt
50 Watt	5 Watt

As a general benchmark, an 800 lumen LED bulb produces the same amount of light as a traditional incandescent 60-Watt light bulb. That means you could use a 150W LED equivalent bulb in a 60W socket and get more than three times the brightness of your old 60-Watt incandescent bulb.

1600 lumens

In other words, 3,000 lumens is meant to give a room a brighter light. This is not ideal if you have a small room and it’s a bedroom. You don’t want to blind your eyes when you’re about to go to bed. On the other hand, 2,000 lumens is ideal if you wish to light up a 200 square-foot living room.

Lumens for Light Source Watts
Lumens	Incandescent Watts	LED Watts
800	60	12
1100	75	15
1600	100	20

Luminous efficacy table

Light type	Typical luminous efficacy (lumens/watt)
Tungsten incandescent light bulb	12.5-17.5 lm/W
Halogen lamp	16-24 lm/W
Fluorescent lamp	45-75 lm/W
LED lamp	80-100 lm/W

10 lux

Notes: Lux: Lux (Illuminance) is a measurement of the light intensity at any point. It is equal to 1 Lumen per square meter….Light Quantity Calculator.

Room Size:	Width x Length:	x meters
	OR Area:	m2
Room Type:		Bedroom / Hallway (100 Lux) Lounge – Minimum (150 Lux) Lounge – Well lit (250 Lux) Office (400 Lux)

In the center of a room, it can drop dramatically, even down to 25 to 50 lux, hence the need for both general and task lighting indoors….Room Lighting Levels.

Bedroom (adult)	General	100–300 lux
	Task	500 lux
Bedroom (child)	General	500 lux
	Task	800 lux
Bathroom	General	300 lux

illuminance

500 lux – Retail spaces should have this as a minimum light level, as should general office spaces. This level should be suitable for prolonged work on computers, machinery and reading. More than 500 lux – If you have an area where intricate work is being carried out, then very high lux values may be needed.

: a unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter.

The Meaning of LUX So now you know – LUX means “Luxury” – don’t thank us. LUX is an acronym, abbreviation or slang word that is explained above where the LUX definition is given.

Aptly named Lux, a word which translates into ‘light’ and pays tribute to Lucifer’s role as the ‘light-bringer’, the club is anything but light-filled, and rather serves as a den of sin of sorts, its debauchery a symbol of the fallen angel’s lifestyle.

The name Lux is a girl’s name of Latin origin meaning “light”.

Badass Girl Names for Your Rebel Princess

Davina	Beloved	Scottish
Diana	Heavenly and divine	Latin
Dola	The crown brings honor	African
Dominique	Lord	Latin
Domino	Lord	Latin

Luxanna Crownguard

If you would like something pretty sounding, these unique baby girl names will fit the bill.

• Annalise. A combination of the name Anna and Lise, it’s simple, pretty, and unique.
• Brigitta.
• Charmaine.
• Constance.
• Geneviève.
• Lorelei.
• Lucinda.
• Micaela.