No not too much light... light per square feet... 55,000 lumens in an hps divided by your square feet should equal more than 7,500 lumens per square foot. So the area of each corner of plants should be less than 8 sq. feet.

If the run-off you're measuring is tinted, the color tests will be skewed. In this case I run it through a coffee filter or paper towel until its clear.

Hempsouth probably has your solution.