You can use the Collection Service, which gives you the ability to assign a tag to all of those PointLights, and then loop through all of the objects that have that tag (in other words all of the PointLights) using :GetTagged(t) which returns a table with all object that have the same tag t.
Read the link I gave you! And here is more info.
local CollectionService = game:GetService("CollectionService")
for i, v in pairs (CollectionService) do
--change the property