You simply cannot buy a better tankless water heater. Each of the tankless water heaters on our shortlist is a top choice in its price/performance bracket. However, the overall winner of our âBest of the Bestâ award is definitely the Stiebel Eltron Tempra 24 Plus.
The difference between the lux and the lumen is that the lux takes into account the area over which the luminous flux is spread. 1000 lumens, concentrated into an area of one square metre, lights up that square metre with an illuminance of 1000 lux.
Lumen)is a measure of the total amount of light emited by a source (luminous flux). Lux is the intensity of that light at a given point (illuminance). lx = lm /m2. The eye takes time to adapt to light, if itâs pitch dark, and you light up all the room with a 1000 lumens light, you will be both impared.