thank you Sunnymau.
I understand orphek lights are strong however tried hanging 60 cm last night, i noticed the lights are too bright and spilling all over the room. Maybe i will do as Larry suggested, which is adjusting height after the water is in and check the best height using a PAR meter.
sorry guys, my build kinda slow... cos got extra work at the office. business expansion really take a lot of time to do.
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