The new LED bars Orphek OR2 Reef Day 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.

Le nuove barre LED Orphek OR2 Reef Day Plus testate a fondo nel DaniReef LAB


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.

Le nuove barre LED Orphek OR2 Reef Day Plus testate a fondo nel DaniReef LAB

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

Le nuove barre LED Orphek OR2 Reef Day Plus testate a fondo nel DaniReef LAB

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

Ceiling light Orphek OR2 Reef Day Plus: 54,69 watt. Considering that at 17 cm the bars have at the middle 393 μmol m-2 s-1, let’s say, in perspective, that it will have a peak value of 7,18 μmol m-2 s-1 w-1 (PAR per watt). It’s hardly comparable with another ceiling light because it remains costant all over the length.

The consumption is slightly under the declared one, while the Cos(fi) is very close to 1, a perfect value.

The comparison with other ceiling lights on the market

Recently we started to use the new Apogee’s Quantum Meter MQ-510.

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

AI Hydra 32 HD at 17 cm560.18543090,501.3036.190
AI Hydra 32 HD at 37 cm 563.23243090,50 1.3106.224
AI Hydra 32 HD at 57 cm 462.61443090,50 1.0765.112
Aqamai LRM at 17 cm642.64946590,881.3827.071
Aqamai LRM at 37 cm721.67646590,881.5527.941
Aqamai LRM at 57 cm616.47046590,881.3266.783
Aqamai LRS at 17 cm275.88128947,599555.797
Aqamai LRS at 37 cm311.54828947,591.0786.547
Aqamai LRS at 57 cm254.28328947,598805.343
Cetus 2 at 17 cm409.99321560,681.9066.756
Cetus 2 at 37 cm 290.86621560,681.3534.793
Cetus 2 at 57 cm 173.65121560,688072.861
Orphek OR2 Reef Day Plus 120 cm at 17 cm255.27718054,691.4184.667
Orphek OR2 Reef Day Plus 120 cm at 37 cm 232.56418054.691.2924.252
Orphek OR2 Reef Day Plus 120 cm at 57 cm 225.14218054.691.2514.117
Philips CoralCare at 17 cm1.858.572749190,502.4819.756
Philips CoralCare at 37 cm 1.340.533749190,50 1.7907.037
Philips CoralCare at 57 cm 933.246749190,50 1.2464.899
Le nuove barre LED Orphek OR2 Reef Day Plus testate a fondo nel DaniReef LAB

The energy produced by each watt stays costant in the different distances in the Orphek OR2. A very good and linear behavior of these LED bars. Now we only have to measure the behavior of other LED bars in order to compare the results.

Mantaining costs

The Orphek OR2 Reef Day Plus LED bars cost 180 dollars, plus the taxes we have to pay because there still isn’t a distributor here, but we have to consider the change of currency so, more or less, it’s the same price, that is 180 euro. The shipping is included.

The absorbed power is 54,69 watt, so the relationship cost/watt is about 3,3 euro per watt. In order to do a comparison with the other ceiling lights we had in our hands you can consult the following chart:

Ceiling lightPriceConsumptionRelationship euro per wattReferences
Orphek OR2 Reef Day Plus180 dollars54,69 watt3,3 euro per wattDaniReef LAB
Cetus 2215 euro60,68 watt3,5 euro per wattDaniReef LAB
Philips Coralcare 2019749 euro190 watt3,9 euro per wattDaniReef LAB
Maxspect Ethereal500 euro126 watt4,0 euro per wattItalian test
Radion XR30w G2 PRO
790 euro170 watt4,7 euro per wattItalian review
AI Hydra 32 HD430 euro90,5 watt4,75 euro per wattDaniReef LAB
Radion XR30w G4 PRO915 euro190 watt4,84 euro per wattItalian article
OceanLed Sunrise 600870 euro180 watt4,8 euro per wattItalian test
Orphek Atlantik V41099 euro226 watt4,9 euro per wattTest
Radion XR30w G2690 euro140 watt4,9 euro per wattItalian review
Radion XR30w G4760 euro150 watt5,1 euro per wattItalian article
Aqamai LRM
465 euro87,5 watt5,1 euro per wattDaniReef LAB
Zetlight UFO ZE-8000500 euro91,5 watt5,5 euro per wattTest
Aqamai LRS289 euro47,59 watt6,1 euro per wattDaniReef LAB
CEAB Slide & Led2.700 euro275 watt9,8 euro per wattReview
Sicce GNC 4661.592 euro120 watt13,3 euro per wattItalian review
Le nuove barre LED Orphek OR2 Reef Day Plus testate a fondo nel DaniReef LAB

The celing light is excellently built, solid and very well assembled. I really like extruded profiles as well as the refinement. It’s very easy to use and you can combine more bars in order to obtain the power you want. Considering that we’re talking about a LED bar the comparison with other ceiling light is very pitiful. But if you consider the total amount of energy you can have the full picture, because the light has to be summed. So the bars are perfect for any coral, you only have to combine an higher number of models. Do you want to double the PAR? Use two bars. Or quadruple? Use four, and so on. The cost per watt is very low, the lowest we’ve ever recorded, while before saying anything about the PAR per watt we should have more bars.

Le nuove barre LED Orphek OR2 Reef Day Plus testate a fondo nel DaniReef LAB

Questions and comments, as always, are very welcomed.