Lumens (lm) measure light output. A 400 lm LED bulb gives the same light output as a 35W incandescent bulb. But it uses only 6.3W of energy. We have light sources in 100 lm, 200 lm, 400 lm, 600 lm, 1000 lm and 1800 lm.
LED bulbs use much less energy compared to the old incandescent types. So you can choose them by light output – in LUMEN – rather than by power consumption (W). Watts measures power consumption. Our light bulbs consume from 1-22W.
LED bulbs containing more red portion in the spectrum provide a warmer light, that’s good for relaxing or as general light. Cooler light is good for working or as focus light. 2700 Kelvin corresponds to the colour of the old incandescent light bulbs.