sounds like you are on the right track, air cooling is nice though for lights, specially in a room that has more light then average. but just straightening your duct as much as possible should increase your exhaust quite a bit. although bends do help with reducing the noise, you do lose power. this is why i always go fully over power so i can run it at 30% to 50% even at lights on in summer this is mainly for the noise reduction, but also to give me spare exhaust power for trimming.
i also think a lot can be achieved by mixing the air well in the room. temps on the ground are always lower then at canopy level, so lots of oscillating fans will help.
i also think a lot can be achieved by mixing the air well in the room. temps on the ground are always lower then at canopy level, so lots of oscillating fans will help.