Lux readings for Solaris VS. MH
Lux readings for Solaris VS. MH
Ok, after all the hoopla about LED lighting and controversy regarding LEDs versus MHs by those that don't yet own such lights... I decided to take the plunge and order a 72" set for myself. I then started taking Lux readings of the two various lighting systems. Some points to consider while looking at the results below:
1) The Lux meter while in interesting tool for measurement may not be that accurate as the values jump around considerably and one has to mount the lens/probe as simply holding it results in numbers that are impossible to record. Mounted the numbers are fairly stable however. For those that may question the accuracy of the meter itself... it's listed as +/- 6% of the reading or +/- 1 digit. I used a Milwaukee SM700 at the X100 setting (a smaller setting results in 'whiteout.'
2) Regardless of the accuracy of the meter, the point of this test and the result given below show a comparison. Since the same controls were used in each reading (same meter, same distance from light), any inaccuracy is really a mute point.
3) Sunlight with this meter was measured at 58,800 Lux and this was direct sunlight at 1:00 PM EST on a bright day with no cloud cover. I found this interesting when compared to the numbers in the first row.... see below.
4) I maintain a very deep sand bed so 18" is roughly the lowest reading I could obtain without burying the lens/probe.
5) The Solaris has different colored LEDs which made it difficult to get readings... especially at 1" away from the light. Therefore I held the lens under the blue LED and then the White LED and averaged the two readings. Readings taken further away from the light were less variable.
6) PAR readings would be interesting here too. I only have a Lux meter and am uncertain just how to convert from Lux to PAR with LED lighting. This conversion is different for each type of lighting as I understand. For example, according to Gerald Deitzer (University of Maryland) one would divide the Lux value by 74.5 to obtain PAR for MH where you divide by 49.0 and 55.2 to obtain PAR from Lux values for incandescent lighting and the sun.
7) Lastly, this was done simply out of curiosity on my part and that of many others that have contributed to this thread with similar questions regarding the output of the LEDs and how they might stand up to similar MH lighting. It was not my intention to start any arguments and I refuse to answer any inflammatory posts. This is simply educational and thus the rationale for this board in the first place.
So far I have to say I'm very pleased with the lights. I keep a mixed reef with SPS (even acros) and LPS. I initially turned down the blues and whites a bit as my Monti caps were browning a bit. Thus the first Solaris readings at 80 and 70% Day and Blues respectively. Remember that this light does focus it's intensity more than MH. After turning the lights down and slowing coming up over a period of 3 weeks my corals are brighter and I can now easily observe the 'changeover' behavior in all inhabitants as the sun rises and sets. :bum:
Happy Reefing everyone!
ReefWraith