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   »About Photometric Testing
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   »News & Events
      »LED Bicycle Light Arms Race
      »Living Lighting Workshop
   »Service Overview
      »Consultancy Services
      »Measurement Services
         »Flash Photometry
         »Lamp - LED - Luminaire Testing
         »Optical Properties of Materials
         »Photobiological Safety
         »Signs & Displays
         »Standard Measurement Service List
      »Training Courses
         »Laser Safety Training Course
         »Photobiological Safety Course
         »Photometry Training Course
   »Site Map
      »Glossary of Terms
      »Guide to Units
      »Photometry Focus
         »Case Study: LightSense LED Ceiling Panel
      »Talking Photometry
         »Are Halogens History?
         »Claimed vs Actual CCT
         »Flicker & Solid State Lighting
         »Guide to Colour Rendering
         »Guide to Colour Temperature
         »Into the Twilight Zone
         »LED Colour Difference Metrics
         »LED Colour Zoning
         »LED Specifications - Fact or Fiction?
         »Measuring Colour Uniformity of LED Arrays
         »Photobiological Safety - Don't Get Burnt
         »The Origins of The Metric System
         »The Perfect Integrating Sphere
         »The Torch with the Power of a Million Candles
         »Understanding Photometric Data Files
         »Useful Lumens