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Actually the human eyes response to light is logarithmic rather than linear, so it doesnt mean you will perceive everything to be 1.5 times as bright.
The difference going from 8 inch to 10 inch is subtle rather than striking. Similarly with going from 10inch to 12.
If you are looking for a worthwhile increase you might want to skip a size. ie go from 6 to 10 inch, or 8 inch to 12.
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