Numbering on box hair dyes!

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Can any hairdressers (or anyone else!) explain the numbering system on boxes of hair dye for me please? I've noticed different brands often have similar numbers. If I want to be a very light golden blonde, do the numbers relate to lightness and/or amounts of red in the dye? Is a 9.2 lighter than a 9.3 for example. It's very confusing.

from a bit of googling 9 is the base colour and runs from 1 (black) to 10 (or higher) for blonde. The number after the '.' gives the primary tone of the colour so 9.2 is blonde with a violet tone and 9.3 is blonde with a gold tone.

www.inoa-us.com/inoa/_en/_us/media/05_nuances/pdf/2011_color_chart.pdf

Ah, you found something! Thanks. I googled and came up with nothing enlightening. No pun intended!