PRO Version (v4.9+)

The PRO version costs less than small coffee ☕️.

Photometer PRO is socially responsible: 10% of the project profits will be transferred to the following foundations:

UNICEF works in over 190 countries and territories to save children’s lives, to defend their rights, and to help them fulfil their potential, from early childhood through adolescence.
In more than 70 countries, Médecins Sans Frontières provides medical humanitarian assistance to save lives and ease the suffering of people in crisis situations.
For 60 years, WWF has worked to help people and nature thrive. As the world’s leading conservation organization, WWF works in nearly 100 countries.


  • Exposure (EV) measurement (+Manual EV)
  • Lux / Foot-candle
  • F-number (F) or Shutter speed (SEC) automatic counting
    • App use 1/8 stop f-number increments: modern and professional electronically controlled interchangeable lenses, such as those used for SLR cameras, have f-stop specified internally in 1/8 stop increments
  • ISO sensitivity from 25 to 409600
  • Measurement Freeze mode & Sharing


  • Light sources options
    • Sunlight
    • Cool White Fluorescent Lamps
    • Mogul Base High Pressure Sodium Lamps
    • Dual-Ended High Pressure Sodium (DEHPS): ePapillion 1000 W
    • Metal Halide
    • Ceramic Metal Halide (CMH942): standard 4200 K color temperature
    • Ceramic Metal Halide (CMH930-Agro): 3100 K color temperature, spectrum shifted to red wavelengths
  • Measuring Daily Light Integral in a Greenhouse (Ariana P. Torres and Roberto G. Lopez, Department of Horticulture and Landscape Architecture, Purdue University)


  • Light volume (Lux or FC) to solar intensity (W/m2) conversion
    • Bright sunlight is approximately 136000 lux = 1075 W/m2. The factor changes slightly depending on time of the day, condition such as cloud cover, moisture in the air etc.
  • Real time light volume graph
  • Light recording


  • Create a room Lightmap – The light intensity map is used to check where the light is strongest and where the light is low

PPFD Calculator

Calculator (Light Calculator)

  • Count light space needs based on the area type and size (Lumens)
  • Count number of bulbs needed to light the area (Information on the number of Lumen of the bulb can be found on the packaging)
  • Lumens measure how much light you are getting from a bulb. More lumens means it’s a brighter light; fewer lumens means it’s a dimmer light. Lumens let you buy the amount of light you want. So when buying your new bulbs, think lumens, not watts.
  • A typical household light bulb might emit anything between 300–1000 lumens, while a high-powered floodlight could emit in excess of 20,000 lumens.

Calculators (Lux & FC / Lumen / Wats)

  • Lux (FC) to Lumen calculation
  • Lumen to Lux (FC) calculation
  • Lux (FC) to Candela calculation
  • Candela to Lux (FC) calculation
  • Lux (FC) to Watts
  • Watts to Lux (FC)
  • Units: meter and feet

Additional features

  • Unlimited CSV export
  • Full samples frequency
  • Sensor calibration