Are you currently using the Coralvue 20Ks. I was doing a ton of reading about them on RC and looked like a mixed response but mostly positive, also talked about less blue than the XM.
Also has anyone ever tried the Hamilton 20K and have any input to what it's like. I found a place where I can get the bulbs for the following price on 400 watters.

20K XM $68
20K Hamilton $52
I believe the Coralvue is between the hamilton price and XM, waiting for reply back.