Handbook of Lighting Design - a good PDF book on lighting design, in English, German and Spanish
The Lighting Handbook - another good guide on lighting, from Zumtobel
IES Lighting in Design - lighting design for domestic spaces
Simple Lighting Blog useful articles, mostly on domestic lighting
Online calculator for room lighting levels: https://www.waveformlighting.com/lumen-calculator - though trying it in my house, I find it overestimates required lighting levels, at least for my taste.
It uses old feet units for inputs, but the result is in lumens. Conversion factors are:
Meters to feet: multiply by 0.3048
Lux to foot candles: multiply by 0.093 (or just divide by 10 for mental arithmetic purposes)
IES Recommended Lighting Levels - US recommended lighting levels in a variety of work environments. Units are foot candles, multiply by 10.7 to convert to lux.
Online colour temperature simulator: https://www.waveformlighting.com/cct-simulator<HR>
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