general question about LC

I’m doing a kitchen so I placed a couple of rectangular plane and all was good if the power of the main light was 60 l/m/m/sr (the LC takes less than 5 minutes with 600sdv)

If the power increase at 75 l/m/m/sr the LC passes takes not less than 2 hours, is it normal this behaviour? If yes Why?

I’m working with a PhysCam and Reinard ColMap.
I didn’t change any of other parameters.
I tried with 600, 400,300 subdivs but nothing changes.

Thanks
Riccardo

If you want I can share the file.

Re: general question about LC

This sounds odd…I’ll try and get back to you tomorrow on this as I’m doing training today.