How to Interpret L, x, y in Color Transmittance Reports?

[metalrock]

Dear folks

The case is this... to measure the color transmittance through a coating on a transparent sheet... and the values are in L, x, y [thought there should be a "y" but its not in the report]...

Can anybody shed some light on how to interpret L, x, y in this report ?

Thanks !

 

[GT1]

Try to google "color space" or "xyY".
I believe your L stands for Y- the luminance component.
From Wiki: http://en.wikipedia.org/wiki/CIE_1931_color_space