No chiller, but ...
400 watt halides on 90 gallon tank in my basement- ran fan on high just above the sump - had to replace evaporated water every day - also had to be careful to have blinds drawn on the basement windows on the really hot days - still got temperature swings of 3 degrees on the really hot days.
Have run with Solaris PFO LED lights for almost a year... no chiller required, temperature fluctuation of 1 degree at most.
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