congrats
so now that you know they are 219c… I wonder if we trust the Opple DUV value, or if it might have underestimated?
also, higher output levels will have lower DUV…
here is info about Lee Filters effect on Tint DUV, thanks to maukka:
.
pic is a link
note each filter lowers DUV by about –0.0040… I would suggest you use the lightest one… minus 1/8
and there is a high temperature version of the filters… the lightest is Zircon 805
Zircon 805: light transmission 86.6% (iow 13% lumen loss)
equivalent to
Lee 279 -Eighth minus green : 87.2%