Honestly. I think u should move your girls closer to the light.
I've yet to see a 250w or even 300 "other than THE GREEN SUNDHINES 300" be to powerful to run a full strength and have it at 30cm away. Which it should be to get the best out of that light. Or just dad save yourself some watts and drop it to 75% strength and 30cm away.
If it's causing such a high temperature, and very hot. Than the led really should be enough. But, that's up to you.
I add UV-A to mine
Good luck.