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.
Step 1. Convert a measurement in lux (lx) to a measurement in lumen (lm). The lumen is the SI unit of luminous flux, which measures the perceived power of light. The difference between lux and lumen is that lux takes the area of luminous flux into account, whereas the lumen does not.