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When you are just comparing two or more setups there are several ways to do it without the PAR meter. It is when you want to compare to some standard or compare to someone's tank in another state that you need a PAR meter. Then, of course, in-the-water measurements would be preferable too.
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Comparison can be made using a Lux meter to get performance results between someone's tank in another state. When comparing light performance the in-the-water measurement might not be the way to go to get meaningful data concerning the lights being used as the water clarity would have a significant effect.
If using a light meter for comparison results how do you calibrate the meter?
Regarding the mylar being tested, was there a reflectivity rating?
Some mylar is advertised as having a 98% reflectivity and other mylar does not advertise a rating.