Diggler's Weird 90 Gallon Reef Tank

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crusso1993

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Just did PAR measurements on my reef, and I am less than pleased.....

PAR 200126.jpg
I would say there is something that is definitely off/wrong. On a 4 bulb, T5 set up you should see much higher numbers everywhere and, especially so, near the top. How high is the light mounted off the water? What lamps are you running in the fixture? What measurement device did you use and how recently was is calibrated?
 
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DirtDiggler2823

DirtDiggler2823

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I would say there is something that is definitely off/wrong. On a 4 bulb, T5 set up you should see much higher numbers everywhere and, especially so, near the top. How high is the light mounted off the water? What lamps are you running in the fixture? What measurement device did you use and how recently was is calibrated?
The light was 10 inches above the glass, and it's an apogee quantam
 
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crusso1993

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The light was 10 inches above the glass, and it's an apogee quantam
Yeah, there's something off. At 10" off the water, you should be seeing much higher readings.

Is the Apogee calibrated correctly? How old are the lamps? What make and type of lamps? Which type of fixture and how old is the fixture.
 
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DirtDiggler2823

DirtDiggler2823

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Yeah, there's something off. At 10" off the water, you should be seeing much higher readings.

Is the Apogee calibrated correctly? How old are the lamps? What make and type of lamps? Which type of fixture and how old is the fixture.
The fixture itself is several years old. The blue bulbs are about 6 months old, and the whites less than a year. The apogee belongs to my local reefing club, and I'm not sure of when it was last calibrated, but I don't have any reason to not trust it to give me ballpark numbers. I'll pull the acrylic shield off the fixture to see how much that helps.
 

crusso1993

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As I am sure you know, not all T5 fixtures or lamps are created equally. Some lamps and fixtures (ballasts) inherently put out more PAR and PUR than others. i.e. - ATI fixtures and lamps put out higher numbers than CoralLife fixtures and lamps.
 
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DirtDiggler2823

DirtDiggler2823

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As I am sure you know, not all T5 fixtures or lamps are created equally. Some lamps and fixtures (ballasts) ingerently put out more PAR and PUR than others. i.e. - ATI fixtures and lamps put out higher numbers than CoralLife fixtures and lamps.
I actually didn't know that. Good to know at this point. Going to try to cut the glass and open things up a bit, which should help in any case.
 

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