Prime 16HD PAR not matching

[LivingroomDiver]

I have 2 Prime 16HD running for about 2 months on my waterbox. I measured the PAR for curiosity. I found out one is running 30-40% lower than the other. For exemple, at current setting and 9" over the water. Right one is at 140 and left one 90 par. Quite a difference and seem low level as well. That's at full blue channels and about 30% white. Just wondering if it's normal. I contacted AI support and they looked at pictures and didn't think there was a problem.

I was hoping for much better performance than that I guess. Probably going to have upgrade sooner than later. Was planning on updating before getting in SPS anyway. Just don't want to sell defectives light if they are.