LED Lux alc

As Lux is a measure of lumens per square metre, you would need to know the lumens output of the LED, its beam angle and the distance from the LED that you wish to measure the Lux.

For instance - a 650 lumen par 38 lamp with 27° beam angle will produce 936 Lux at 2 metres and 234 Lux at 4 metres, a 650 lumen par 38 lamp with a 47° beam angle will produce just 312 Lux at 2 metres and 78 Lux at 4 metres.

If your LED is rated in Watts instead of Lumens, then you will first have to convert it to Lumens with the formula - Lumens = watts X luminous efficiency.

Typical luminous efficiency of an LED can range from 25 to 300 lumens per watt (l/w), so a 12 watt LED with an efficiency of 50 l/w would produce 600 lumens

You do realize, I hope, that LED's come in a rather large variety of sizes, shapes, and light output levels.

Most of the specifications I've seen are in terms of Candela, or candle power.

Interestingly enough, even typing the lame-a$$ title of your thread into a search engine would produce "about 461,000 results in 0.29 seconds".

Sadly, you will never know what any of this means and will remain unenlightened forever.