So I took a bunch of reading with my Seneye today here are some of the results
Tank: 25g IM Nuvo black, I had all flow off so the water surface was at about about 10.5" mark
Light: mounted in the center of the tank 7.5" off the water
Par meter: seneye on a cpvc wand I built
Reading were taken at the
Bottom: (this is approximately 1" - 1.5" off the bottom because of the thickness of the sensor
Mid Tank: I just eyed this up so they may be slightly off. If I was going to do this again I would make cpvc spacer that would hold the sensor at the exact height I wanted to test
Top: I made sure there was about 1" of water over the sensor
I tried to keep the sensor level so that I would get the effects of reflection off the glass (I did see higher readings in the from vs the back of the tank (this tank has a black back pane of glass)
Here is the setup, it's in my bathroom to test the plumbing. I also lowered the light about 1.5" before I did the tests
Some initial readings
UV at 100% directly below the light is 100 par at the surface and 25 at the bottom
For the rest of the tests I kept the UV at 100 Red at 20 and Green at 10 (this seems to be what I've heard people using over there tanks so I went with it)
So here are some reading with intensity at 100 and changes to the color from 0-100
All reading have two values, directly over the light and on the side of the tank (12 from the light, this was harder to get so has some variance)
Color (Intensity 100)
0 - Top: 405/120 Mid: 225/100 Bot: 155/70
20 - Top: 460/60 Mid: 290/90 Bot: 170/75
40 - Top: 480/80 Mid: 280/150 Bot: 170/90
50 - Top: 470/150 Mid: 290/140 Bot: 169/120
60 - Top: 450/115 Mid: 260/130 Bot: 165/80
80 - Top: 425/110 Mid: 280/155 Bot: 165/90
100 - Top: 400/120 Mid: 270/100 Bot: 170/80
As you can see pretty decent par numbers for this tank. Also the whole color range is pretty close in par value
I did a similar test but I changed the intensity
I used a color of 40 as I liked that and kept UV at 100, red at 20 and Green at 10
Intensity (color 40)
20 - Top: 270/100 Mid: 150/85 Bot: 85/40
40 - Top: 330/100 Mid: 210/95 Bot: 130/120
60 - Top: 440/120 Mid: 260/80 Bot: 140/77
80 - Top: 460/130 Mid: 270/165 Bot: 165/110
100 - Top: 460/150 Mid: 310/160 Bot: 165/160
I also did a grid across the whole tank with color at 40 intensity at 60 and uv-100, r-20 and g-10
Here are some the interesting readings
- Back corners on the bottom were about 50 par, the front corners were about 120 par. My guess is from the reflection off the side and front glass.
- the top corners were all around 50 par, I wasn't expecting much but that is still decent and shows the spread on this light
- the middle of the tank (12" from the front glass and 5" from the bottom read as follows
Left Side - 140
Left side 6" from side glass - 220
Middle - 240
Right side 6" from side glass - 220
Right side - 120
I think 60% int is a great starting point for me as it put most of my acros in the 200 par range and as the grow toward the surface they will get higher par.
Hope this help people
Len
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