crabs new 24" cube

[i have crabs]

i bought a ushio 20k bulb today to replace the 12.5k giesmann that came with the light and im much happier with the color and relieved that its not super blue like i though might happen so thats good,
i did some quick par readings before and after
top left before was 590 and droped to 380
and middle right was 360 and dropped to 250
so approx 35% drop in par which seems a bit high but i expected a drop which im fine with, the new bulb was only an hour or so old so ill test it again in a few days maybe.