> In principle, is using the L*channel a good way to approach the grayscale
> conversion?
Not if the goal is an attractive image with any apparent resemblance to what
one would achieve by shooting the subject with panchromatic B&W film.
> Are there better ways I should consider?
Create a channel mixer adjustment layer and tick on the Monochrome check
box. You can then blend the three color channels together non-destructively
with even more control over the results than would be possible with a
traditional film and filter approach.
You can alternately simply change modes from RGB to Grayscale, which will
give you a preset mixture of mostly green channel data. If you're not going
for fine art prints, this may be acceptable for your material.
There's also this method which I've had quite a bit of success with, but the
number of variables involved make it much more of a trial-and-error process
that can be rather time consuming:
http://www.thelightsrightstudio.com/DigitalDarkroom/Tutorials/MakingAFineArt
B&WImage.pdf
> Is there a reason why I would be seeing such a shift in apparent luminosity
> when discarding the a and b channels?
Yes, because you're throwing large amounts of data away.
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