LED Panel

[sherman]

In 2011, however, a US company SinkPAD (www.sinkpad.com) has offered a patented technology called SinkPADTM, allowing it to dissipate the heat from LEDs thermal pad directly to МСРСВ’s metal.

[sherman]

The structure of the SinkPAD МСРСВ is shown in Fig 5:

Fig 5 SinkPAD MCPCB structure

 

[sherman]

You can see the raised portions of the МСРСВ metal in the picture, which touch the LED’s thermal pad directly; whereas, the electric traces are situated on a separate PCB. This approach results in a significant reduction of thermal resistance, and the more LEDs there are on the MCPCB surface, the more pronounced is the effect. Therefore, this technology is preferred for our МСРСВ which will be densely populated with power LEDs.

[sherman]

Is your multi chip led array using this technology?

[sherman]

Tomorrow we go to challenge number 3. Filling up the spectrum

 

[sherman]

Challenge number three: Filling up the spectrum 
Below, we shall consider the general rules which we believe are important when designing a LED assembly, pointing out the problems and solutions that we had found in the process.
We believe that only the best (most efficient) bins are suitable for making the LED assembly

At the same time, higher conversion efficiency means less heat generation, which is also a significant factor, especially within a LED fixture’s confined space. If not specified otherwise, we always use the most efficient LED bins that are available in commercial quantities at the time of manufacture

[sherman]

Spectral considerations
We have pointed out the importance of violet spectrum multiple times. Beside the high photosynthetic activity, this spectrum provides strong fluorescence and at the same time, it is very poorly visible to the human eye. We have also shown that, in natural sunlight, the amount of radiation in this part of the spectrum is significant. Therefore we install on our assembly several true violet LEDs with different wavelengths, covering the 400 to 430nm range. Spectral differences between these LEDs are hardly visible to the eye, and therefore we combine them all in one chain, without the possibility of individually controlling each sub-range.
Unfortunately, high quality and efficient violet LEDs are still very expensive and in fact, if installed in sufficient quantity, they account for most part of the LED assembly’s overall cost

Quality bin LED below 420 nm is very expensive.

Range anything from USD 30 to USD 400 per piece

 

[sherman]

The next important component of the assembly are white LEDs
White LEDs are readily available for a moderate cost, even when the most efficient bins are requested.
Spectral distribution of light emitted by a cool-white emitter LXML-PWC2 (by Philips) is shown in Fig 6 (a), and a warm-white emitter LXW9-PW27 in Fig 6 (b) below:

[sherman]

Fig 6a) Radiation spectrum of LXML-PWC2 (5650K) Cool-White emitter at Test Current, Thermal Pad Temperature = 25C
 

 

[sherman]

Fig 6b) Radiation spectrum of LXW9-PW27 (2700K) Warm-White emitter at Test Current, Thermal Pad Temperature = 25C
 

 

[sherman]

We believe that cool-white LEDs with 6000-8000K CCT are best suited for the LED assembly to be used on a reef tank.
The next color that is worth having, in order to better fill the gap in white LEDs spectrum, is cyan, or turquois, with wavelengths around 510nm.

[sherman]

Lately many manufacturers of LED fixtures have also been including green LEDs in their products. We believe that this is an unnecessary option. First of all, the true green spectrum, in the 530-560nm range, is already present in sufficient amounts in the spectrum of white LED, and therefore a separate green LED is not required on the assembly. Another disadvantage of using separate green LEDs is that so far the efficiency of commercially available green LEDs is extremely low and, to make their addition meaningful, a significant number would be required (even though the human eye is most sensitive to green spectrum), and this will affect negatively the overall heat generation by the assembly. We believe that adding just a few green LEDs to the assembly, like most manufacturers do, is a tribute to fashion and does not have any noticeable impact on the aggregated spectrum of the fixture.

[sherman]

That is why I do not encourage the addition of green light

[sherman]

Base on the earlier writeup about light spectrum and the short coming of using individual led and what to take note when using multi chip leds to overcome the disco effect of individual led in aquarium light manufacturers has come up with the latest led array for the next generation led light for reef aquarium
Below are 3 of the best known on market today. This does not include led aquarium light manufacturers like AI, Radion and Kessil, etc

[sherman]

Below are some available multi led array on market
V3 le array by Nanobox

 

[sherman]

V3 Led array by ReefLL

 

[sherman]

Lumia 5.2 reef

 

[sherman]

Looking at the 3 led arrays above do you recall something familar

[sherman]

So now I have to choose between a lumia 5.2 or nano box V3 or Reef Led Lab V3 or get some vendor to produce a led array base on my own design

[sherman]

Lumia 5.2 is a 25 leds, 5 channel array. NanoBox V3 is 13 leds ,4 channel array and Reef Led Lab is 12 leds , 7 channel array

[sherman]

One Lumia 5.3 cover 24x24 x24 inch. One NanoBox V3 or Reef Led Lab V3 cover 12 x 12 x 24 inch

[sherman]

ATI T5HO light spectrum equivalent for led user

AquaBlue Special: Full spectrum with blue tint
Blue Plus: 410nm - 450nm
Purple Plus: Full spectrum with Red and blue tint
Coral Plus: 50%Blue Plus + 40% Aquable Blue special+ 10% Purple Plus

 

This is just a guideline for DIYers who like their diy LED light set to light up

like their T5HO

[sherman]

After months of browsing and reading through many led light pendents spec and feedback in many forums I finally come up with my ideal led light array.

 

 

[sherman]

Recently Lani from Triton catch my attention. 
It concept is different from the crowd of led light like hydra 52HD, Radion X30 G3 Pro ,kessil A700, Nano Box ,etc
All is using 10 to 15 led cluster concept with lens
But Lani is running small cluster of 5 leds .
All using Full spectrum of different color leds. But Lani go back to basic of white ,blue and purple.
All running at close to 1A but Lani running at 1 watt.

 

[sherman]

But the high price make few reefers dream come true.
Are you also daze by Lani led set?
Is there an affordable way to own a Lani?
This dream fill my brain SINCE Jan 2016
I must do something to fullfill my dream....
Watch out.....