Whilst light transmission isn't the be all and end all of scopes, you need to find out if that's per lens, or over the whole scope, and see what Leupold describe when they talk about 98% transmission of say the VX-III series.
I doub't many could tell the difference to be honest. With glass you tend to get what you pay for, albeit some scopes sit higher or lower than where they should do on the price curve.
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