chinese led lights

[BigCountry74]

Interesting. Their Website list it as:

2" depth - 1537 Par
PAR reading 12" depth - 423 Par
24" depth - 182 Par

***?
lol

 

[Travis1787]

He has the 20k ones though big country are you looking at those or the 14k ones you got? Maybe the same anyway but never know

 

[BigCountry74]

Par is the same via their site for the 14 and 20. Just think it's weird the numbers are 1/2 off. Very weird.

 

[alanmorehead]

Taotronics 120w 55 LED black unit:
http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=150726029374&ssPageName=ADME:L:OC:US:3160

 

[alanmorehead]

 

[alanmorehead]

PAR meter: Apogee Quantum Flux (Model MQ-200)

Summary (Centered):
@ 2": ~2650
@ 6": ~1150
@ 12": ~410
@ 18": ~175
@ 24" ~100

Testing setup:

***********************************************
24"
***********************************************

24" Centered (Blue ON, White ON) => 102

24" Edge (Blue ON, White ON) => 77

24" Corner (Blue ON, White ON) => 62

24" Centered (Blue OFF, White ON) => 37

24" Edge (Blue OFF, White ON) => 26

24" Corner (Blue OFF, White ON) => 21

24" Centered (Blue ON, White OFF) => 63

24" Edge (Blue ON, White OFF) => 51

24" Corner (Blue ON, White OFF) => 43

 

[alanmorehead]

***********************************************
18"
***********************************************

18" Centered (Blue ON, White ON) => 175

18" Edge (Blue ON, White ON) => 102

18" Corner (Blue ON, White ON) => 74

18" Centered (Blue OFF, White ON) => 65

18" Edge (Blue OFF, White ON) => 35

18" Corner (Blue OFF, White ON) => 25

18" Centered (Blue ON, White OFF) => 110

18" Edge (Blue ON, White OFF) => 66

18" Corner (Blue ON, White OFF) => 51

 

[alanmorehead]

***********************************************
12"
***********************************************

12" Centered (Blue ON, White ON) => 408

12" Edge (Blue ON, White ON) => 106

12" Corner (Blue ON, White ON) => 66

12" Centered (Blue OFF, White ON) => 148

12" Edge (Blue OFF, White ON) => 37

12" Corner (Blue OFF, White ON) => 24

12" Centered (Blue ON, White OFF) => 251

12" Edge (Blue ON, White OFF) => 68

12" Corner (Blue ON, White OFF) => 50

 

[alanmorehead]

***********************************************
6"
***********************************************

6" Centered (Blue ON, White ON) => 1145

6" Centered (Blue OFF, White ON) => 418

6" Centered (Blue ON, White OFF) => 719

***********************************************
2"
***********************************************

2" Centered (Blue ON, White ON) => 2640

2" Centered (Blue OFF, White ON) => 964

2" Centered (Blue ON, White OFF) => 1546

 

[jeffesaurusrex]

What do these par number mean in an actual tank environment? For example, is 100 par at 18 inches good enough to keep a clam on the sandbed? SPS anywhere? Or are those low numbers that would limit stocking choices and locations?

 

[kbell2433]

Thanks for the par numbers. I was wondering the par on those dimmable ones.

And like jeffesaurusrex says, what do these par numbers mean? and what can you keep at these depths with the par numbers?

 

[sirreal63]

This is fairly close, but some are a little understated, consider this a minimum for healthy corals. Good job on the numbers Alan, I wonder how far off the Apogee 200 is from the mega one that Sanjay uses, supposedly the one he has reads all of the spectrums more accurately.

 

[jk1138]

Wow, a lot of work! Thank you. I have 2 of the Taotronics over my frag tank and I am testing a plate coral and an sps frag. The SPS seems to be doing good after 12 days, the plate coral frag seems to be losing color. I am thinking too much light. Time will tell.

 

[dz6t]

Is the AquariumLEDs.com unit really 120w? If yes, it means they drive the chips to max wattage?

 

[submersible]

I have the 120w version (55 leds) but it is more exact to say 145 watts (checked with a kill a watt).

I finally could install them in my tank. I am very pleased with the color. I had a single actinic t5ho to supplement in case it was necessary, but there is no difference if the t5 is on on or off, the leds are just too intense.

In terms of light spread is really good, I have two units hanging at 10cm (4 inches) from the tank. The tank dimensions are 56 x 24 x 24 (140 x 60 x 60).

jucario, Do you have the Taotronics or unbranded version? Looks like theres some variation in wattage. :hmm3:

 

[BigCountry74]

I have 3 anemones 24"+ under the aquariumled 14ks, one is a bicolored that requires some light that has been sitting there for a month and 1/2. Not that I am questioning the par readings, but @ 55 par I simply do not think they would be living?

Edit - anemones can live @ 50-100 par at the sand bed
hehe


Hey big thanks for those par readings. that really makes this thread golden.

 

[TropTrea]

Par is the same via their site for the 14 and 20. Just think it's weird the numbers are 1/2 off. Very weird.

It could be the differences in the meters they are using. Most PAR meters realy drop off in there sensativity when you get below 490 nm. With Aquarium lighting you actualy want 90% of your light comming from under 500 nm.

As far as the 14K to 20 K difference goes if the LED's are equaly as effecient the numbers should be very simular. However with lack of sensitivity on the meters at the shorter wave lenghts it is understandable that meter reading will be lower. After all most PAR meters were designed for maximum accuracy in the red range which most terestial plants love.

Sorry I do not put a lot of weight on PAR meters for aquariums. You can take a 2,800K florescent bulb and get a much higher reading than you would on an equal wattage and type 14,000K bulb. But your corals will gtrow and look much better with the 14,000K bulb.

Also a point to consider is that the measurements taken where in Air while the corals are in a tank with many objects. Between shadows, reflections, and attenuation the numbers will probably much different.

 

[tntneon]

Hi TropTrea ,

what we really wanna know is PUR if i'm right ?
I'm wondering if there are PUR - meters on the market for corals ?
Or can one calculate the amount of PUR by examining the spectral curve ?

greetingzz tntneon

 

[MBizzo]

I just got the newer version in the mail today. It's 120 watts, 30 blue, 25 white, all running at 2 watts. Its extremely bright but my only problem is how loud the fans are and more importantly this very annoying ringing noise!! Tried asking about it on another thread but no luck

 

[shiladitya1991]

That light is an SPS killer...:hammer: