I agree, too expensive and only need it for ten minutes! So what I did was to follow
@saltyfilmfolks advice and knowledge and use an inexpensive LUX meter to set my lights.
I actually call it the Poorman's PAR meter......a LUX meter that is. For me it was hard justifying spending 3-400 dollars on a piece of equipment that I'd use for ten minutes and then not touch again until I got new lights. Yes, I'm cheap. However,
@saltyfilmfolks wrote a number of posts on how to use a LUX meter and convert those numbers to PAR....especially for LED lights. I consider saltyfilmfolks an expert on lighting and unfortunately he hasn't been on the site in some time. Anyway, a LUX meter only cost around $15 (and I just looked and the one I purchased is now $18), and I could afford that! I used this in setting up my new lights I got about 4-5 years ago and worked like a champ. Bottom line, we measure everything else in our tank, and lighting should be one of those things we measure as well. If I remember my LUX numbers correctly, for LED's you want a LUX around 25K, and for very high light corals, maxing out at 40K. If interested I'm sure you can search on saltyfilmfolks for the number of posts he made about using a LUX meter.
HERE is but one example from Salty.
And, if anybody is interested,
THIS IS THE LUX METER I HAVE.