Type of meter you are using for measurements - apogee mq210
Type of lighting.. be specific as possible and include things like manufacturer, age, length and type of bulbs for those t5 users, wattage and reflectors for the MH users. - i'm using a Hamilton Cebu sun with 2x250w radiums, 2 ATI blue plus, and 2 Hamilton 10k t5 bulbs
LED users if possible include percentages used for different colors
Height of lighting over your water - light is about 12" off the water surface
Depth of water - around 20"
Pumps or power heads running? - my gyres were turned off
Any other factors that may contribute to readings such as room lighting, windows, tank in sunroom? etc.
A picture with measurements would be ideal but a list/description would be fine as well.
Provide as many collection points as possible such as bottom of tank left, right and center.. middle of tank left, right, center, front and back etc.
Just thought I'd share my PAR map of my 120 gallon reef tank, 48"x24"x24" I'm running 2 x 250 watt MH with Radium bulbs in Sunlight Supply Lumen Max Elite reflectors with m82 Ballasts (MH bulbs are 9-10 months old running at 6 hours a day) and 2 x 48" Orphek Blue Plus LED bars
PAR is 1200 at water surface.
This picture is not current, but was the best one to add numbers to without fish swimming all around and getting in the way. Also, the numbers are an average since the PAR was fluctuating within about 10 either way.
Hope that helps...I may be changing things around and modifying the lighting and if I do I will post those readings as well.
I used 3 different PAR readings here. The T5's were about in the middle of their life, maybe about 5 months old. They used wrap around reflectors, and it was an old Tek T5 retro inside a hood painted white that has the bulbs about 5 inches off the water line in a 75G tank.
I used an apogee sensor but cheaped out on the full meter setup. I use a meter calibrated against a Fluke Calobrated meter I borrow from work. The calibration is done yearly. I also spot check against full sun measurements.
The LED's I reference were two sets of 14, 3W LED's between the bulbs. As I recall they did not have lenses during these measurements. The LED and 4 bulb were both with 4 T5's. The 6 bulb measurements removed the LED's. PAR-READINGSLEDT56T5 by Wiskey2727, on Flickr