EULUMDAT is a data file format used for specification of photometric data especially intensity distributions from light sources such as lamps and luminaries. The file extension is .ldt. The format was proposed by Axel Stockmar (Light Consult Inc., Berlin) in 1990. The format is the European equivalent to the IES file format specified in IESNA LM-63. The data in an EULUMDAT file is usually measured using a goniophotometer.
Sweep or Vacuum Dirt Daily. Removing the dirt, sand or dust that is tracked in on a daily basis should be done every day. That's right, every single day. The best way to keep your hardwood floors clean and prevent damage is to sweep or vacuum them daily.
Use a damp mop and never get the floors very wet - water is the enemy of hardwood floors, especially if you allow pooling. If there is excess water, you can soak it up with an old terry cloth towel. Here are a few great suggestions I followed for my hardwood floors: How to Clean Hardwood Floors.