Lumens and watts: how much light do you need?

Lumens (lm) and watts (W) measure two different things: lumens measure the amount of light, watts measure energy use. In the LED era you can no longer judge brightness by…

How to choose the right colour temperature

Colour temperature is measured in kelvins (K) and decides whether light looks warm or cool. It has no effect on brightness — only on how a room feels. What kelvin…