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.
Lux is the basic unit of illuminance in the International System of Units (SI). Lux measures the amount of luminous flux per unit area. Lux (lx) is defined as one lumen per square meter (lm/m2). 1 lx = 1 lm/mm2. 1 Lumen per Square Meter: Lumen per square meter is equal to Lux (SI unit). A measurement of the number of Lumens falling on an area of one square meter, the definition of Lux. 1 lm/m2 = 1 lx. http://www.kylesconverter.com/illuminance/lux-to-lumens-per-square-meter. Lux to Lumens per Square Meter.