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I have dual 400 watt 14K MH. The bulb manufacturer is Reef Grow and the ballasts are (I beleive) pulse start from an unknown company. The fixture is a free hanging hood that is 14 inches away from the surface of the water.

Here is what I need:

1) a measurment as close to the bulb as possible

2) a measurment 1 inch below the surface of the water

3) a measurment 12 inches below the surface of the water

4) a measurment 24 inches below the surface of the water (or on the bottom of the tank which ever is shallowest).

5) post your lighting specification just as I did along with your measurments

Since the MH are point source and the T-5s are diffused, I will take 2 measurments from each depth, 1 measurment directly under the bulb and one measurment at the widest angle possible (prolly the edge of the tank). I will post each measurment and the average measurment.

We can then take the LUX and divide it by the wattage to see what we come up with.