Calculation total floux
Lumens to Lux
Lux to Lumens
Lumens to Watts
Watts to Lumens
Lux to Watts
Watts to Lux
Lumens to Candela
Candela to Lumens
Candela to Lux
Lux to Candela
Table luminous efficacy
Color temperature
Lamp fittings
Type of lamps
Fluorescent tubes
Color code of fluorescent tubes
Power factor correction
Lux meter (is compatible only on devices with light sensor)
Typical led characteristics
Conversion Lux / Foot-Candle
Compare power

v4.5.0
* New: Luminance / Exposure value converter
* New: Illuminance / Exposure value converter
* Fix: Purchases with Android 4
* Upd: General update of the languages
v4.3.4
* Imp: Taking long screenshots
* Add: Hindi language (by KamPoo)
* Upd: Arabic language (by Tamim Hamrit)
* Upd: Russian language (by Murtozakul)
* Upd: General update of the languages
4.3.3
* Fix: Change language on Android 7 and lower
* Fix: WebView
* Upd: Indonesian language (by Sony Bejo)
* Upd: General update of languages
v4.3.2:
* Mod: "Photobiological safety of led" is available in the FREE version
* Imp: Luminous efficacy now also supports decimal numbers
* Upd: Portuguese
language (by Elder Henrique de Souza)
* Upd: General update of languages
4.3.1
* Mod: Some graphical improvements
* Upd: General language update
4.3.0
* Mod: Restyling of some graphical components
* Upd: Spanish language (by Kovalsky)
4.2.2
* Fix: Crash when backing up in read-only locations
v4.2.0:
* New: Sheet "Favorites"
* Fix: Values of "Light sources"
* Mod: Migration to AndroidX
* Add: Page with other apps
* Upd: Russian language (by Murtozakul)
v4.1.4:
Minor bugfix
v4.1.3:
* Upd: Russian language (by Murtozakul)
* Upd: Portuguese
language (by Daniel Quicoli)
* Upd: Support to Android P
* Mod: Improved landscape layouts
4.1.2
* New: Settings backup
* Add: Selectable result
* Add: Bosnian language (by Ferid)
* Add: Pinterest Profile
* Upd: Portuguese [PT] language (by Leandro Sousa)
* Mod: Removed Firebase Invites
4.1.0
* New: Print support
* Fix: Some layouts RTL
* Fix: ViewPager
* Fix: Crash in Kruithof curve
* Mod: Removed support for serial number
* Upd: Russian language (by Murtozakul)
* Upd: Portuguese
language (by Valria)
* Upd: German language (by Andreas)
v4.0.0:
* New: General reorganization of the calculations
* Upd: Updated some languages
* Fix: Minor bugfix
v3.0.0
* New: Quantity of luminaires
* New: Kelvin to RGB
* New: RGB/HEX conversion
* New: RGB/CMYK conversion
* Add: Conversion lumen/lux with angle and height
* Add: Preliminary compatibility with Chromebook
* Add: Notification of updates
* Upd languages: Simplified Chinese (T.Hongpeng), Arabic (zawazaid and A.Qaissia), Magyar (S.Marosi), Portuguese [PT] (L.Sousa), Persian (S.Asadbeygi), Russian (GudWin), Czech (Skipy), Polish (A.Stiller), Greek (T.Pergantis), Romanian (S.Ionescu)
v2.2.1 (22/05/2016)
* Add: Search bar
* Add: Romanian language (by Silvian Ionescu)
* Upd: Portuguese
language (by Matheusiin Villela)
* Mod: Luxmeter calibration up to 300%
* Fix: Input lux into the "Calculation of total flux" now accept decimal numbers
* Fix: Update of utilization coefficient
* Fix: MultiprocessPreferences bug
* Fix: Bug 8bit request code

v2.2.0
* New: Luminance converter
* New: Illuminance converter
* New: SMD led
* New: Material design also for older devices
* Add: Foot-Lambert and Nox into "Unit of measurement"
* Add: Formulary icon into action bar
* New: Buttons layout
* Fix: Feet bug into Luminance on the floor
* Fix: Distinction between GU10 and GZ10
* Add: Portuguese-BR (Fraga J)
* Upd: Portuguese-PT (L.Sousa), Vietnamese (N.Duy Trung), Czech (Skipy), Polish (A.Stiller), Greek (T.Pergantis), Bulgarian (Yassine)

v2.1.0
* New: Bulb shapes
* New: Unit of measurement
* New: Visible spectrum
* Upd: Turkish language (by Bekir Aydogdu)
* Upd: Polish language (by Adi Stiller)
* Upd: Portuguese [PT] language (by Leandro Sousa)
* Upd: Czech language (by Skipy)
* Upd: Russian language (by GudWin)
* Upd: Updated Arabic language (by Abdusalam Qaissia)
* Upd: New table layouts
* Fix: Compatibility with Android 6.0

v2.0.0:
* New: Illuminance on the floor
* New: Energy saving lamp
* New: Formulary
* New: Symbols
* Mod: Color temperature is now free
* Add: Splash screen
* Fix: Improved some layouts
* Upd: Portuguese [PT] language (by Leandro Sousa)
* Upd: Vietnamese language (by Nguyn Duy Trung)
* Upd: Turkish language (by Bekir Aydogdu)
* Upd: New license check of the Pro Key

v1.1.10:
* Add: Added Czech language (by Skipy)

v1.1.9:
* Add: Added Lithuanian language (by Martynas Patinskas)
* Add: Added Simplified Chinese partial language (by Min Li Lim)
* Upd: Updated Arabic language (by Abdusalam Qaissia)
* Upd: Updated Turkish language (by Bekir Aydogdu)
* Imp: Improved some layout

v1.1.8:
* Add: Added & Update Vietnamese language (by Nguyn Duy Trung)
v1.1.7:
* Add: Ability to sort calculations
* Add: Added Persian language (by Behnam Lashgari TJ.)
* Add: Added Croatian language (by Goran Arabadi)
* New: Material Design Theme for Android 5.0
1.16
* Новое: Блок питания для светодиодной ленты (New: Power supply for strip led)
* Исправлены некоторые значения освещенности (Fix: Fixed some illumination values)
* Добавлен болгарский язык (Христо Ганчев) (Add: Added Bulgarian language (by Hristo Ganchev))
* Добавлен польский язык (drzordz) (Add: Added Polish language (by drzordz))
* Обновлен португальский язык (Леандро Соуза) (Upd: Updated Portuguese [PT] language (by Leandro Sousa))
* Обновлен русский язык (Djek.Energetik) (Upd: Updated Russian language (by Djek.Energetik))
* Добавлена справка (Add: Faq)

Новая патченная Pro версия для девайсов с arm7 и arm64, в каталоге Old предыдущие версии, работающие на Android 2.3+.