The following example shows how the Luminance Contrast Assessment Tool (LCAT) can be used to check two colours against each other to determine if a 30% luminance contrast will be achieved. In this case, visual pictograms on an overhead sign will use a Dulux Outrageous Red colour, with the adjoining surface of the sign using Dulux Button Eyes. The question is, does this combination provide a 30% luminance contrast?
Dulux Outrageous Red, LRV 15
Dulux Button Eyes, LRV 7
Image Source: https://www.dulux.com.au/specifier/colour/colour-atlas
When the two LRV values, 15 and 7, are entered into the LCAT we get these results, which confirms the paint colour combination will NOT achieve a 30% luminance contrast, as it only achieves a 21% luminance contrast.
You can get a copy of the LCAT here or view other examples of the LCAT in use here: