Yes, that works. Thanks for the tip.
So if I get this right a Corona light isn't actual geometry so it can't be visible when turning off Reflections, but a Corona Light Material is applied to geometry so it CAN do this. As far as I can see the Corona Light Material has all the options a normal Corona light has but it's different in this one thing, why isn't there an option available to turn a Corona Light into geometry so it can only be visible for reflections? I'm asking because I do a lot of product visuals and I'm changing the light settings all the time, so having to pick a material with the material picker and the changing the settings is an annoying extra step which I have to do a lot of times.