Photometric Units

Photometric Units

SI Units



Non-SI Units

Luminous Intensity
candlepower = the candela

Luminance
1 stilb = 1 cd/cm² = 10,000 cd/m²
1 apostilb = (1/p) cd/m² = 0.3183 cd/m²
1 lambert = (10,000/p) cd/m² = 3183 cd/m²
1 millilambert = 0.001 lambert = 3.183 cd/m²
1 footlambert = (1/p) cd/ft² = 3.426 cd/m²
1 candela/ft² = 10.76 cd/m²
1 candela/in.² = 1550 cd/m²

Illuminance
1 footcandle = 1 lm/ft² = 10.76 lm/m² or lx






LATEST NEWS

• CLEO Heads to the East Coast
  Apr 29, 2024
• Laser-Based Gas Analyzer Developed to Detect Air Pollution
  Apr 29, 2024
• Qubits Could be Stored in Flash-Like Memory
  Apr 29, 2024
• Exail Signs LLNL Contract, Partners with Eelume
  Apr 26, 2024
• Menlo Moves U.S. HQ: Week in Brief: 4/26/2024
  Apr 26, 2024
• Optofluidics Platform Keys Label-, Amplification-Free Rapid Diagnostic Tool
  Apr 25, 2024
• DUV Lasers Made with Nonlinear Crystals Enhance Lithography Performance
  Apr 25, 2024
• Teledyne e2v, Airy3D Collaborate on 3D Vision Solutions
  Apr 24, 2024