my 500 gallon reef tank

[steve the plumb]

I took par measurements outside the tank but I also took par measurements inside the tank I just didn't make a video of it because I was alone and its hard to do both at the same time never mind the fact that
My stand is 3 feet tall
The tank is 28 inches deep
My access cover or opening is 24 x 15 so its kind of hard to hold a video camera,the par meter and try not to drop anything in the tank.

I did place one unit on my tank over the middle of it.So the unit was penetrating though 3/4 inch acrylic and I took a reading at the bottom of the tank (I don't have much sand) and my par reading was between 125-138.You have to understand I am also standing on a ladder while doing this.

It was easier to hang the unit and do a test over the floor just to see the light spread.If my tank was an open style tank or had a single brace and if it was smaller it would be more simple.
You guys have to understand this tank is huge I have trouble getting anywhere in the middle of the tank.I have no step in the back of the tank so I step on a bucket in order to try and do anything.I have to build some kind of step onto my stand because there is no way in hell I could have any way of playing around with the tank or if a coral falls I am up sh*ts creek.