Glossary

TermDefinitionUnitsHow to interpret
Color TemperatureColor of lightKelvin (K)Sunlight at sunrise is
1800K
100W Incandescent light
bulb is 2850K
Overcast Sky is 6500K
Color Rendering Index (CRI)Lights effect on colorScale of 0 to 100 with sunlight at 100The higher the number,
the more "true" the color
will look in that light
BrightnessThe intensity of the light.LumensThe higher the lumens,
thebrighter the light
PowerAmount of electrical energy consumedWattThe lower the watts,
the lower the energy consumption
EfficancyThe efficiency of the bulb to convert electricity into lightLumens perWattMore efficient bulbs provide more light using less energy