Alright here we go:
I really do appreciate everyone that has provided some valuable data while using the LumenBrights. It appears the majority doing these tests are also 12K Reeflux bulb and Coralvue ballast owners. Looks like a pretty nice package
Now that I switched to the LumenBrights, I also have the same package. So if you look at it like this, there are 3 tests here with data from the exact same lighting system. Kurt, I do realize you have 2 - 12K's going. But still some Reeflux data.
I have been seeing around the forums lately, thread after thread of people that want to take Sanjay's data on Coralvue Reeflux bulbs as scripture. Meaning they don't give off as much par as other 14k bulbs? I was blown away when I looked up the bulbs a few months ago after seeing Mike's(Acropora Nut's) tank in person. Even with the Lumenarcs, these bulbs were bright. Much more so than the mere 159 ppfd Sanjay showed with a magnetic ballast on a 400w 12K Reeflux. Please people. Something is up here. All of us are pulling readings on a Coralvue electronic ballast that does not represent Sanjay's findings. He did not even test the ballasts that these bulbs were meant to be fired from. Is it the ballast causing our high readings? Maybe? Is it the reflector? Now we are on to something
What was most shocking to me about his data is his tests of a 250w 12K Reeflux was much less than most 14K bulbs I was seeing. Geez, I was running an EVC 14K that he measured at 71ppfd on my EVC electronic ballast. He measured a 250w 12K Reeflux at 54ppfd on an EVC ballast:hmm5:
What? a 54
After changing out a 4 month EVC bulb and putting on a 250w 12K, I noticed immediately my tank was a lot brighter. I find it very hard to believe that a 250w 12K can be so weak. I measured it today and will post just for kicks what my readings were under a 7 inch Lumenmax reflector. Something does not add up here.
I do realize our testing environment is slightly different from an open air room with no ambient light and a peg board for proper orientation of the sensor. Great! What do I care about a bulb in the air with no coral in sight anywhere. I am not knocking science and I do appreciate people doing what they do so that we can have somewhat of a guage, but it does not relate to a hill of beans to what we are trying to accomplish. Scientific studies need to be repeated in order to get a real guage of what a bulb can do. Taking readings underneath the water is the only true representation of what we can expect from a bulb to help us grow our coral in each of our individual aquariums. I am so glad I picked up this meter because I can know in an instant what my intensity is anywhere in the tank. I was quite surprised that my individual placement of the species of coral I have obtained was pretty much right on the money without the meter. Having it verified for me just makes it that much more reassuring. Like a warm blanket.
I think the data that Deuce, Kurt and I are showing here is some of the most telling evidence of what these bulbs and reflectors can do. Spread is not an issue people and I feel no need to discuss it any furthur. I am showing 350-400PAR in the middle of my 5ft tank half way down underneath an 18" glass center brace.
A water change was last done on this tank 5 days prior to testing. I typically do weekly water changes, so I am curious what readings would be like if my water was crystal clear. Might be worth testing after doing a carbon change as well. All readings were recorded when a value had sustained at least one second on the meter. I do feel the placement of your arm in the tank will inhibit these reflectors causing a reduced reading. You must be careful to not get in the way of these facets that are trying to direct light from all sides. A "cone" of light if you will. I pretty much took readings wherever there was a coral as well as some bottom tank shots on the sand and even under a ledge that was shaded.
Here are my results from yesterday: Enjoy...
And hopefully if you don't mind Deuce and Kurt: two others -
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These bulbs are 16 inches off the water - 16 inches!!! and we are all reading this high on these bulbs. What is even more interesting is how much PAR there is as you move away from the bulb. I guess I was wrong Hahn, these little babies do work away from the bulb, much different then the Lumenarcs. I actually did some PAR readings of a 22" old school Diamond light with a friend yesterday to show that the spread on a Diamond Light does not mean diddly squat. No usable par a ft and a half away from the bulb. I will be posting those findings as well. More to come...