Could someone please explain to me what "lux" means I have seen it in several places but I am not sure what it means, 1400 lux 2500 lux @ somthing? What is the purpose of this?
As Keygrip says, it's a measure of intensity of the light. Lux is technically lumen per square meter but it can be measures at a smaller surface. Lux numbers taken at the same distance can be compared to see which light throw better then another(most numbers here are taken at 1 meter).
Candle power usually serves the same purpose but many companies misuse them.
This is in the Welcome Mat FAQ and the Wiki, but I'll answer it here as well. No, they are not the same. There is no way to directly compare the two as the measure different things.