I am new to blender. I am trying to change the light strength on multiple lights. I cannot figure how to change them all at once. I see how to change objects, but not lights. Any tips out there?
Select all your lights, go into the Object Data panel, press Alt LMB on the Strength or Power value, type the new value and Enter. Or select all your lights, select the one you want to copy the strength from at last, and right click on its Power value > Copy to Selected.