LED bars Orphek OR2 Blue Plus tested in our DaniReef LAB

How to value these numbers in aquarium?

This is a good question. At first we thought that we could transport these values to the aquarium tout-court. Than we filled the aquarium, insert the probe and redone the measurements. We fazed but, as we have already said in elsewhere, we’re going to talk about this in another article. Basically, while at 20 cm the result is practically the same, as we progressed, thanks to the glass and the water itself reflecting the light, we found even the double of the values measured in air. Obviously this isn’t a detail that can be standardized, so we think that our method of calculation is the most correct, and the best for the comparison of coverages of different ceiling lights.

Power Consumption

The measurement of the consumption was made possible thanks to the useful device RCE PM600 that can also measure the Cos(fi) (or power factor). The result is already given in watt.

Here above there’s the maximum power and below the Cos(fi).

The calculus of the absorbed current, that is the power, is the following one:

Orphek OR2 Blue Plus ceiling light: 54,69 watt. Considering that this ceiling lights at 17 cm has 459 μmol m-2 s-1 in the middle, we can say, in perspective, that it will have a peak value of 8,39 μmol m-2 s-1 w-1 (PAR per watt). This value is hardly comparable with other ceiling lights because it remains constant throughout the length.

The comparison with other ceiling lights on the market

Recently we started to use the new Apogee’s Quantum Meter MQ-510. For this we can’t completely compare the data of other ceiling lights because before we used the probe Seneye.

But considering the first celing lights we managed to test we can do an interesting comparison about their produced energy:

The produced energy per watt is costant throughout the different distances in the Orphek OR2. This linear behavior is typical of LED bars. Now we have to test other bars and do proper comparisons. Don’t be deceived by the PAR higher of other ceiling lights, because it has a prevalence of blue and it behaves differrently, so it can’t be comparable tout-court.

Mantaining costs

The LED bars Orphek OR2 Blue Plus cost 180 dollars, and we have to add the taxes because there isn’t a national distributor. But considering also the change in euro, we still could buy it at 180 euro. Deliver included.

The absorbed power is 54,69 watt, so it has a relationship cost/watt of 3,3 euro per watt. In order to do a comparison with the other ceiling lights you can refer to this chart:

As we have said for the OR2 Reef Day Plus, the ceiling light is very well built, solid and well assembled. I really like the extruded borders as well as the refinement. There isn’t a programming that assures a simple modality of use, you can also assit it with other bars in other to obtain the power you need. In this contest we have to focus on the measured PAR, given that that’s not possible to do a proper comparison with other ceiling lights. But if you consider the whole energy you have a more realistic picture. So the bars are perfect for breeding corals, but you have to take the bars you need. Do you need twice the PAR? Use two bars. Do you need four times the PAR? Use four, and so on. The cost per watt is incredibly low, the lowest among the one we tested, while before comment the value of PAR per watt we have to test other blue bars. What else to ask to a LED bar?

Questions and comments, as always, are welcomed.