Duplicate with Clone mode and Instances Mode works, Render Instances mode does not.
Instance works (the Instance Object anyway)
Tossing the light in an Array works but not if Render Instances is checked in the Array object
Same thing with a Cloner, if Render Instances is checked, nothing but unchecked all clones are visible but they are not as bright as they should be- that can be fixed by increasing the Visibility Multiplier under the Show In Render checkbox. just multiply 100 times the number of lights (or less than 100 if you don’t want full brightness)