If you are leaning towards LEDs, then there is a PAR chart somewhere...I will try to find it (or if someone has it, please post). It lists the PAR levels that constitute low, medium, and high light. Let's say if low light is between 10-30 PAR (just an example) and you wanted low light then you would look for a fixture with an output in that range at that distance (light to substrate).
Several manufacturers have posted PAR levels for their LED
fixtures at various distances. As for brands that come with kits that info may be hard to find (unless someone took a PAR meter readings and posted them).
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