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« Universal Usability | Main | Lecture 3 - colour models »

Lecture 3 - Measuring light

Radiance (Watts) - the total amount of light emitted by a source in all wavelengths. For a 100W bulb, only 10-15W of the output is in the visible range. Someone asked about OLEDs. Which are apparently Organic Light Emitting Diodes. They seem to be very efficient, but a bit bleeding edge still at the moment. OLED-info.com has lots more information.

Luminance (Lumens) - the strength of light that is perceived by the human eye. Apparently the SI unit for this is the Candela...

Brightness - totally subjective. A measure of how bright an object appears to be.  

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