lux

This hashtag in English

Last updated 17w.

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. It is analogous to the radiometric unit watt per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception. In English, "lux" is used as both the singular and plural form.

The word is derived from the Latin word for "light", lux.

Illuminance is a measure of how much luminous flux is spread over a given area. One can think of luminous flux (measured in lumens) as a measure of the total "amount" of visible light present, and the illuminance as a measure of the intensity of illumination on a surface. A given amount of light will illuminate a surface more dimly if it is spread over a larger area, so illuminance is inversely proportional to area when the luminous flux is held constant.

One lux is equal to one lumen per square metre:

A flux of 1000 lumens, spread uniformly over an area of 1 square metre, lights up that square metre with an illuminance of 1000 lux. However, the same 1000 lumens spread out over 10 square metres produces a dimmer illuminance of only 100 lux.

Achieving an illuminance of 500 lux might be possible in a home kitchen with a single fluorescent light fixture with an output of 12000 lumens. To light a factory floor with dozens of times the area of the kitchen would require dozens of such fixtures. Thus, lighting a larger area to the same level of lux requires a greater number of lumens.

As with other SI units, SI prefixes can be used, for example a kilolux (klx) is 1000 lux.

Here are some examples of the illuminance provided under various conditions:

The illuminance provided by a light source on a surface perpendicular to the direction to the source is a measure of the strength of that source as perceived from that location. For instance, a star of apparent magnitude 0 provides 2.08 microlux (μlx) at the Earth's surface. A barely perceptible magnitude 6 star provides 8 nanolux (nlx). The unobscured Sun provides an illumination of up to 100 kilolux (klx) on the Earth's surface, the exact value depending on time of year and atmospheric conditions. This direct normal illuminance is related to the solar illuminance constant Esc, equal to 128000 lux (see Sunlight and Solar constant).

The illuminance on a surface depends on how the surface is tilted with respect to the source. For example, a pocket flashlight aimed at a wall will produce a given level of illumination if aimed perpendicular to the wall, but if the flashlight is aimed at increasing angles to the perpendicular (maintaining the same distance), the illuminated spot becomes larger and so is less highly illuminated. When a surface is tilted at an angle to a source, the illumination provided on the surface is reduced because the tilted surface subtends a smaller solid angle from the source, and therefore it receives less light. For a point source, the illumination on the tilted surface is reduced by a factor equal to the cosine of the angle between a ray coming from the source and the normal to the surface. In practical lighting problems, given information on the way light is emitted from each source and the distance and geometry of the lighted area, a numerical calculation can be made of the illumination on a surface by adding the contributions of every point on every light source.

Like all photometric units, the lux has a corresponding "radiometric" unit. The difference between any photometric unit and its corresponding radiometric unit is that radiometric units are based on physical power, with all wavelengths being weighted equally, while photometric units take into account the fact that the human eye's image-forming visual system is more sensitive to some wavelengths than others, and accordingly every wavelength is given a different weight. The weighting factor is known as the luminosity function.

The lux is one lumen per square metre (lm/m2), and the corresponding radiometric unit, which measures irradiance, is the watt per square metre (W/m2). There is no single conversion factor between lux and W/m2; there is a different conversion factor for every wavelength, and it is not possible to make a conversion unless one knows the spectral composition of the light.

The peak of the luminosity function is at 555 nm (green); the eye's image-forming visual system is more sensitive to light of this wavelength than any other. For monochromatic light of this wavelength, the amount of illuminance for a given amount of irradiance is maximum: 683.002 lux per 1 W/m2; the irradiance needed to make 1 lux at this wavelength is about 1.464 mW/m2. Other wavelengths of visible light produce fewer lux per watt-per-meter-squared. The luminosity function falls to zero for wavelengths outside the visible spectrum.

For a light source with mixed wavelengths, the number of lumens per watt can be calculated by means of the luminosity function. In order to appear reasonably "white", a light source cannot consist solely of the green light to which the eye's image-forming visual photoreceptors are most sensitive, but must include a generous mixture of red and blue wavelengths, to which they are much less sensitive.

This means that white (or whitish) light sources produce far fewer lumens per watt than the theoretical maximum of 683.002 lm/W. The ratio between the actual number of lumens per watt and the theoretical maximum is expressed as a percentage known as the luminous efficiency. For example, a typical incandescent light bulb has a luminous efficiency of only about 2%.

In reality, individual eyes vary slightly in their luminosity functions. However, photometric units are precisely defined and precisely measurable. They are based on an agreed-upon standard luminosity function based on measurements of the spectral characteristics of image-forming visual photoreception in many individual human eyes.

Specifications for video cameras such as camcorders and surveillance cameras often include a minimal illuminance level in lux at which the camera will record a satisfactory image.[citation needed] A camera with good low-light capability will have a lower lux rating. Still cameras do not use such a specification, since longer exposure times can generally be used to make pictures at very low illuminance levels, as opposed to the case in video cameras, where a maximal exposure time is generally set by the frame rate.

The corresponding unit in English and American traditional units is the foot-candle. One foot candle is about 10.764 lux. Since one foot-candle is the illuminance cast on a surface by a one-candela source one foot away, a lux could be thought of as a "metre-candle", although this term is discouraged because it does not conform to SI standards for unit names.

One phot (ph) equals 10 kilolux (10 klx).

One nox (nx) equals 1 millilux (1 mlx).

In astronomy, apparent magnitude is a measure of the illuminance of a star on the Earth's atmosphere. A star with apparent magnitude 0 is 2.54 microlux outside the earth's atmosphere, and 82% of that (2.08 microlux) under clear skies. A magnitude 6 star (just barely visible under good conditions) would be 8.3 nanolux. A standard candle (one candela) a kilometre away would provide an illuminance of 1 microlux—about the same as a magnitude 1 star.

Unicode has a symbol for "lx": (㏓). It is a legacy code to accommodate old code pages in some Asian languages. Use of this code is not recommended.

Hitman, Ars, Surf, Clips, Mook, Lux, Roc
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@tmok_lux とにかく色々お話したいから通話はしたいね、MIX中で良ければ時間は…⚆.̮⚆ 本格的に活動者側でびっくりしてる、でもほんとにあの喋り声は伸びると思うよ?? やばい。友達もユニ(人形)動かしてるってわかっててシナリオ選んだんだと思うけど、やばい。
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그렇다면 지니도 유진 L. 스티카가 되는 수 밖에 없겠군! [2]
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@sche1dt Amiga???? É nova era, Lux não quero nem mais saber
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@Isabelle_wiifii @Stopauchouinage @AmazonNewsFR @Lux_Aeterna_TW @AvBgEnVs @AldoSterone111 @Renaud_Sand En flag moi…
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A4D2BD67 :参戦ID 参加者募集! Lv200 フェディエル
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On peut masquer des emojis ?
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The #LUXNetwork celebrates all of you working hard to keep us going today and every day! Happy #LaborDay and enjoy…
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ピエピと鹿ちゃんの風船モーションが同じ担ぐ系だったから体格的にも容姿的にも似た系統のマリー様とおジョゼの風船モーションが同じようなのになってもおかしくはないと思うんですけどね…おジョゼにはサバイバーをボロ雑巾みたいに扱ってほしいんですよね…どうなるんでしょうね…
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@GuyLapointeSQ À partir de 2:24. À voir ce que vous ferez de ces infos, seul l'avenir nous le dira. Un pour tous, t…
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【EXPG STUDIO NEWS‼️】 SEGA SAMMY LUXオリジナル楽曲♪ 「LUX 107.7 POWERMIX」 「Lose Control」 ↑こちらの楽曲、EXPG Lab(TOKYO)久保玲奈が歌唱しており…
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Nicht neu: Rechtsextreme sind Waffennarren. Relativ neu: Das @BVerwG_de sinkt die Hürden, um Ihnen die Waffen zu en…
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Ponad 400 tysięcy złotych - tyle pieniędzy trafiło z dwóch ministerstw na konto Fundacji Lux Veritatis, której prez…
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@DanteRi37076981 @EDUARD_ARTS @El_Lury @OShadowenyell @EDD87500274 @s4nscraftgamer @lux_kiy @2lucariogamer ewe
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every day when i give lux kissies i tell him he smells like cat spit
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RT @BIpty3EfK9kFksS: 拡散出来れば希望 super junior LUXキャンペーン責任者からの回答 先日某フリマサイトにあがっていた葉書、popの転売ですが、社内で検討し、通報処置をとりましたとのことです。今後みつけたら通報していいのかと問い合わせました。…
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@Lux_hypnosub Uncomfortably hot maybe
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RT @lukinhasmtr2: sua energia sempre vai chamar mais atenção que sua aparência física.
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@btsblueyes Not at ALL.
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@hotategames ホンマそれなんよな…
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@amalgamarara @EDUARD_ARTS @El_Lury @OShadowenyell @EDD87500274 @s4nscraftgamer @lux_kiy @2lucariogamer °^°
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@lux_miki 🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄…
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@lux_miki 🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄…
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【海外作品】天然石ブレスレット …
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@lux_miki 🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄🌹🦄…
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@gi_viroli Se é main lux, deus não castiga duas vezes
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SCQ_1 2021-02-04 1:44 am :: Temp 13.60000:: Hum 95.30000:: Lux 0
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@EDUARD_ARTS @amalgamarara @El_Lury @OShadowenyell @EDD87500274 @s4nscraftgamer @lux_kiy @2lucariogamer Moderación…
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@DanteRi37076981 @EDUARD_ARTS @El_Lury @OShadowenyell @EDD87500274 @s4nscraftgamer @lux_kiy @2lucariogamer ovo
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@lux_miki 💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚🦄💚…
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I prefer to celebrate Lux on the day he came into the world, but all the posts remind me love for Lux Interior is e…
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life is tough but so are you #แจกันเข้ากองเพลงบินแล้ว
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97E82EA5 :Battle ID I need backup! Lvl 120 Macula Marius
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@ValentiaDreams @CorruptionSick @FoldUpToys @Lux_fae And it should impossible for bees to fly but they can still fl…
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@Lux_hypnosub Dagger? You crave intimacy. You want to be as close as possible, whether you’re dommy, or subby
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RT @dilbagbal29: Lux cozi ਯੇ ਅੰਦਰ ਕੀ ਬਾਤ ਹੈ, ਬੁਰਾ ਨਾ ਮੰਨੇ ਕੁਛ film ਸਟਾਰ ਐਂਡ ਕ੍ਰਿਕਟਰ ਕਿਸੀ ਕਾ lux pehan ਕਰ ਆ ਗਏ ਥੇ ਤਬਹੀ ਤੋ ਯੇ ਅੰਦਰ ਕੀ ਬਾਤ ਹੈ.…
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@YaGalAlexis @CorruptionSick @FoldUpToys @Lux_fae They didn’t study the fluid produced which required massive amoun…
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RT @faeriefountain: This was the exploration I took to final in game topdown concept for Pajama Guardian Lux
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RT @PunKandStuff: Remembering Erick Lee Purkhiser, aka 'Lux Interior' who died on this day in 2009 #TheCramps Photographed at Hammersmith…
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RT @faeriefountain: This was the exploration I took to final in game topdown concept for Pajama Guardian Lux
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おはようございます☀︎ 本日16:30まで出勤いたします♡ 次回は12:30すぎ〜ご予約頂けますので お時間合いましたらいろはに 会いに来て欲しいです😌🌸 お部屋温めて待っています...♡ #神田 #銀座 #ラグタイム
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aí não consigo nem olhar mais pro projota sério
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@an_enby_ How dare...
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RT @faeriefountain: This was the exploration I took to final in game topdown concept for Pajama Guardian Lux
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13時からでした!
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Quinn did her best to gulp down the shyness that had been building up to this point. A soft smile spread across her…
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SCQ_2 2021-02-05 1:58 am :: Temp 17.90000:: Hum 60.20000:: Lux 0
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@DanteRi37076981 @amalgamarara @El_Lury @OShadowenyell @EDD87500274 @EDUARD_ARTS @lux_kiy @2lucariogamer Ya ves asta hago reír 😎
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Elementalist Lux Light - LoL
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Lux Concept Art from League of Legends #art #artwork #videogames #gameart #conceptart #illustration #leagueoflegends #lol #characterdesign
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Steam Community :: Dota 2
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Star Guardian Lux From League Of Legends
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guardianas estelares
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Aelin and Aedion. Fan Art of Ezreal and Lux for fans of League of Legends.
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Winky Lux Confetti Balm is the life of the party. With pH-activated ingredients, the color-enhancing Confetti Balm is a vegan lip stain that applies clear, then reacts with lips' natural pH-levels, leaving lips looking perfectly pink with a glint of shimmer. Winky Lux is a joyful makeup and skincare brand founded by Natalie Mackey. The brand includes a luxurious, yet accessible, range of innovative beauty formulations with cleaner, kinder ingredients, designed to provide real results. Winky Lux
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So Extra Mascara
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Sauder International Lux Console Table In Satin Gold - Add a dash of modern sophistication to your living space with this Sauder International Lux Console Table. Framed by a satin gold finish, this luxurious table features open shelving for displaying books, framed photos, collectibles, and more.
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Knitting & Crochet na Instagrame: „Merhaba arkadaşlar jakar işlemeli bebek battaniye mi işlerken bennnn😂😂😂 . . 🎀Himalaya Bebe Lux Antibakteriyel ipten örülmüş ve…“
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oh ma god
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Elementalist Lux Light - LoL
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Steam Community :: Dota 2
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guardianas estelares
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Estaño En Rollos 33% Sn-100 Grms 539066 Lux . Estaño En Rollos 33% Sn-100 Grms 539066 Lux .
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leblanc, league of legends, League of Legends / lux - pixiv
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lux Pinterest Ideas
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Jun 23, 2020 17:04
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#lux #fashion
Jun 23, 2020 17:05
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Jun 23, 2020 17:05
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Jun 23, 2020 17:05
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✨ᴄᴏᴍɪɴɢ sᴏᴏɴ✨ ʜᴀɴᴅᴘɪᴄᴋᴇᴅ ɢɪғᴛs ғʀᴏᴍ ᴏᴜʀ ғᴀᴠᴏᴜʀɪᴛᴇ ᴘᴀʀᴛs ᴏғ ᴛʜᴇ ᴡᴏʀʟᴅ.✨
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Jun 23, 2020 17:05
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Jun 23, 2020 17:06
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Summer 2020 collection is coming 👌❤️
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Jun 23, 2020 17:06
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✨ᴄᴏᴍɪɴɢ sᴏᴏɴ✨ ʜᴀɴᴅᴘɪᴄᴋᴇᴅ ɢɪғᴛs ғʀᴏᴍ ᴏᴜʀ ғᴀᴠᴏᴜʀɪᴛᴇ ᴘᴀʀᴛs ᴏғ ᴛʜᴇ ᴡᴏʀʟᴅ.✨
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Jun 23, 2020 17:06
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Xəyallarınızı gərçekləşdirəcəyiniz ünvan 👷🏻‍♂️🏢Mənzil ,villa,restoran ,butik ve s,-in zövglü dizaynı Əlaqə nomrəsi📱:050-551-59-94 #azerbaycan #baku #baki #azerbaijan🇦🇿 #dizaynerler #interyerdizaynerbaku#interiordesign #dizayn #içmimar #lux #designinterior #concept
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Jun 23, 2020 17:06
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✨ᴄᴏᴍɪɴɢ sᴏᴏɴ✨ ʜᴀɴᴅᴘɪᴄᴋᴇᴅ ɢɪғᴛs ғʀᴏᴍ ᴏᴜʀ ғᴀᴠᴏᴜʀɪᴛᴇ ᴘᴀʀᴛs ᴏғ ᴛʜᴇ ᴡᴏʀʟᴅ.✨
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Jun 23, 2020 17:07
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✨ᴄᴏᴍɪɴɢ sᴏᴏɴ✨ ʜᴀɴᴅᴘɪᴄᴋᴇᴅ ɢɪғᴛs ғʀᴏᴍ ᴏᴜʀ ғᴀᴠᴏᴜʀɪᴛᴇ ᴘᴀʀᴛs ᴏғ ᴛʜᴇ ᴡᴏʀʟᴅ.✨
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