Ill start
1) MH
2) Electronic Coralvue
3) 400W
4) 1.5 weeks old
5) 10K
6) Lumenarc minis
3" below the water line, directly under the bulb, I was getting a reading of 1650. All pumps were shut off during the test.
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Not sure what these readings means so far. Ill try to find out or have someone who has experience chime in. Anyways, i also tested my 110W VHO. The lamp is only 2 weeks old. 2" away from the lamp, I was getting 180.