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Glossary of Terms

Guide to Units

Talking Photometry

Photometry Focus

Our glossary of terms helps you to navigate your way through the complex terms and units used to express the output of light sources.

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There's a miriad of weird and wonderful units which are used to express the colour and brightness of light. We've compiled a handy list of the important parameters together with their notation and units. Anyone for nits?

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Our technical blog helps you keep up to date with developments in LEDs, solid state lighting and the world of photometric measurements. Our blog is updated regularly with news and useful explanations. We also publish "Talking Photometry", as an email bulletin delivered direct to your in-box. Click here to email us and register to receive our regular e-bulletin.

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"Photometry Focus" column is published monthly in Lighting Magazine. Each article reports on the best of the lighting products that have passed through the Photometric Testing laboratory.

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Are your bulbs making you incandescent? Are your white LEDs making you see red? Help is at hand - in our technical resource area (we hope you don't mind our awful puns though). Our technical area includes a handy guide to units and a glossary of terms to help you to navigate your way through the jargon used in photometry and light measurements. We also post regular updates to our Talking Photometry Tech Blog - articles to help you understand the important metrics used to express the output of LEDs and other light sources. You'll also find the Lighting Magazine "Photometry Focus" articles - these review the best-of-the-best in lamps and luminares that we test each month. Still in the dark? Simply use our Enquiry Form to submit your light measurement question and we will endeavour to illuminate you.