How to chose a chiller ?

coachd

Member
I am going to be running 4 250 watt MH along with around 250 watt of compacts. All are going to be retro fits in a canopy.
Is it best to run the lights while I am cycling to see how the temp will be to determine if I need a chiller?
If I need a chiller will I get one based on the size of the tank(165g) or do I also consider how much I need to lower the temp?
Is there other lower cost options instead of the $700 I am seeing for chillers.
Thanks for your input.
 
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