|For light souces, displays and signs, we measure the amount of light produced, its colour, its rendering quaility and its spatial or angular distribution. We also report the energy efficiency (LOR, luminous efficacy, energy efficiency index) and photobiological risk group. We compile photometric data in .ies and .ldt (EULUMDAT) standard formats as well as UGR glare rating tables. We also measure the optical properties of materials (reflectance, transmittance and scatter). » More
||What is "flicker" and why is it a problem with SSL?
How to measure the colour uniformity of arrays of LEDs
Understand why phosphor white LED lighing can suffer from undesirable colour zoning
» More Talking Photometry articles
||Dec 2016: congratulations to Mr Anthony Worsdell of Consolite who won our Christmas Hamper Prize Draw - thanks to all who took the time and trouble to return our recent client surve
Feb 2016: 2016 training schedule - dates for photometry & light measurement, photobiological safety and laser safety training workshops have been announced
Mar 2015: Size IS important and we've just invested in a 2m integrating sphere photometer for our Cheltenham laboratory
||Feb 2017: Photometric & Optical Testing Services is holding a one-day “Living Lighting” workshop on April 4th 2017 to help business and technical leaders understand some of the most important technical challenges facing the lighting industry and to present the latest developments in lighting safety standards and performance metrics. The event name “Living Lighting” was chosen to reflect the scope of the workshop, which is to promote the highest quality of lighting.
Experts from industry and academia will talk on four areas of popular concern to lighting professionals:
► LED flicker and product risk assessment in relation to IEEE 1789
► The assessment of the photobiological safety of lighting products per BS EN 62471 and 60598
► The new IES TM-30 light source colour rendering metric
► Glare from LED luminaires – what it is and how it can be reduced