The ones we have are both Apogee brand- we have 1 of the older MQ-200 and 2 of the newer MQ-510. The 510 is better at reading more blue colored lighting. They are pretty expensive.
Another option is to rent from bulkreefsupply.com, they ship it to you. It‘s pretty affordable and in case you aren’t familiar it’s a great company. Then, later once you‘ve been a member here for a while, just borrow the club’s. Most people find they don’t need to own their own.
I'm running 2 Aqua Knight Led's on a 20 gallon fusion I purchased from BRS. I was using one on a 10 gallon nano for about 9 months and worked really great now that I've upgraded and using 2 I was just curious about the par output.