John Marchant
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It should be possible to measure - objectively - how much light it blocks compared to the LLO right? Are we talking half a stop?
If it were an ND, it would be that simple, but the different OLPF colour calibrations each transmit different wavelengths of light to differing degrees. The noticeable blue tint of the STH OLPF is due to this, for example.
I know it sounds like I'm being counterproductive, but describing any one OLPF as a fixed amount brighter, darker, cleaner, noisier etc is never going to be possible.