Ventilation from lighting should be seperate from room ventilation,also your room entilation should be stronger tha the lights ventilation,the room vents then get filtered through carbon filters & the higher pull from room vents will assure that the light vents only pull heat from the lights & not room air.
Air intake(fresh air from outside room ) to lights then vent straight out of room.
Air intake at ground level for room ventilation,this intake can be passive(no fan) as long as the room vents are of enough cfm to have a strong pull,then run a room vent of high enough cfm to exchange 100% of the air in your room within 3 minutes,on the exhaust vent either you can buy a carbon filter or make your own,the exhaust fan should pull air through the filter then push the filtered air from the room.
Dont forget in room air circulation,keep as much volume of air moving around the room as possible,this keeps the fresh air moving & keeps any smells from lingering around any passive air intakes.