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Old 04-19-2015, 07:21 PM   #21
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I don't believe a 20-30nm difference in a LED color means much to a coral. It's intensity.

Not meaning to downplay your technical knowledge, I just didn't like your tone and thinking your education and training is any better than many of the rest of us. Sorry if I misunderstood you.


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Old 04-19-2015, 08:13 PM   #22
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In my case, I didn't keep the emitter cool enough. My fault really as I had no idea how hot they got compared to a regular LED. Stupid mistake as I was using 100 watt matrix LEDs in my home made lights and on flood lights we put in big buses. Needs a very effective heat sink. Kessle has designed a nice light and I am sure it will serve you a long time!


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Thanks for the info. I currently have mine on a goose neck addition hanging over the tank. It's a pretty open space, should I take further precautions?
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Old 04-19-2015, 08:16 PM   #23
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I think your using it exactly as designed. Good airflow around the fixture.


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Old 04-19-2015, 08:17 PM   #24
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If you have no actual experience with a fixture, then you have no experience with it. I have plenty of experience with these fixtures, and just like these fixtures can be filled with sub-standard components, so can any other company's units, if the stock market doesn't go right or if sales are down.
The bottom line, no matter how much schooling anyone here has, is that any one of those cheapo units (I've tried many that looked slightly different and they all did the same job) can grow corals just fine with lower wattage, no bulb changes and very little heat.
Who here is measuring PUR? Last I checked , no one had that sort of equipment. If someone suddenly has, why not put these relentless debates to rest?
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Old 04-19-2015, 09:58 PM   #25
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So which is better kessil or the chinese fixture?
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Old 04-19-2015, 10:27 PM   #26
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T5 vs. MH vs. LED

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So which is better kessil or the chinese fixture?

IMO, if I were to have a frag farm, I would use Chinese fixtures and consider them expendable. It's about money then. But for a nice fixture you can run exposed and looks high tech and is usually full spectrum, your choice is really nice too. I can appreciate the engineering and design that's in a fixture like yours. But both grow coral.


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Old 04-19-2015, 11:27 PM   #27
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Although I never said 1 Kessil can cover a 6' tank, I did say they will output 3-4 times as much light. Of course it is down, and only a fool would use 1 light over such a large tank.

As for using PAR, instead of lumens, that is stupid. PAR is a dangerous term that means nothing. PUR is the value you should be recommending. If the frequency/wavelength of light is wrong (ie green) all the par in the world won't satisfy corals. PUR is the narrower part of the wide PAR band (PAR IS EVERYTING FROM 400-700 nm) that photosynthesis occurs. Other than the fact that PAR meters are much cheaper than PUR meters, they can lead to a dangerous misunderstanding of light received.

As for nobody using lumens, that's absolutely wrong. Just your misunderstanding of what lumens is. Lumens is the amount of light radiated by a fixture. And that was the correct context I was using it. It has nothing to do with light on the sand bed or anywhere else. And the useful rating of lumens per watt tells everybody how efficient a transmitter is at converting expensive electrical energy into light energy.

A lighting unit rated at 30 lumens per watt will swallow 4 times the electricity as a 120 lumen per watt fixture, all else being equal. Of course Kessil, producing their own LEDs, and other companies like radion that get the newest edition LEDs from the first bins will NOT be equal to cheap units that get the bulbs from what we refer to as the garbage bins.

Lumens - good rating for fixture's transmission
PUR - good rating for light received by corals
PAR - bad rating for light received by corals


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I agree 100% to what you are saying. PAR is the amount of light generated but not necessarily totally used by corals. It is the amount of light within a band of frequency for plants, corals and others. You can have a very bright light but if it is not in that band of frequency, you can burn your corals without enough PUR. In short, the right frequency of the light and its intensity are responsible to produce the right PUR. Has anyone heard someone used lighting fixture for plants in his reef tank? It has enough PAR but not enough PUR for corals. As i was saying LEDs are not created equal in the sense that they have different applications and efficiency. They can also be used for house lighting and automobile and they have different frequency (color) or Kelvin rating. That is why we refer to spectrograph of a light fixture before we buy it. Here is the reason why taotronics don't have one. It is a shotgun light. It may be cheaper but you are wasting energy.

http://aquariumopinions.com/2012/03/...light-reviews/

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Old 04-20-2015, 01:45 AM   #28
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So which is better kessil or the chinese fixture?

I guess that's like asking which is better, a Ford Focus or a bmw. Both will serve their purpose in taking you where you need to go for a long time. But the bmw is a better quality vehicle, looks nicer, and may last you longer. But you also pay more moolah. I wanted a very nice tank, one where I wouldn't feel the need to upgrade the lights in the future, so I worked some overtime and got the Kissel. Everyone has an opinion though.


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Old 04-20-2015, 08:53 AM   #29
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I never said a Kessil wasn't as good as one of these units, I simply said they work, and work well for much less than anything else. If you have unlimited funds, I vote Radion XR30W Pro.

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Old 04-20-2015, 09:16 AM   #30
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Quote:
Originally Posted by jeffaquarius View Post
I agree 100% to what you are saying. PAR is the amount of light generated but not necessarily totally used by corals. It is the amount of light within a band of frequency for plants, corals and others. You can have a very bright light but if it is not in that band of frequency, you can burn your corals without enough PUR. In short, the right frequency of the light and its intensity are responsible to produce the right PUR. Has anyone heard someone used lighting fixture for plants in his reef tank? It has enough PAR but not enough PUR for corals. As i was saying LEDs are not created equal in the sense that they have different applications and efficiency. They can also be used for house lighting and automobile and they have different frequency (color) or Kelvin rating. That is why we refer to spectrograph of a light fixture before we buy it. Here is the reason why taotronics don't have one. It is a shotgun light. It may be cheaper but you are wasting energy.

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PAR is not the amount of light generated...that's lumens. PAR is the amount of light generated in that is between 400 and 700nm.
LOL..I've heard the term "shotgun" plenty of times. Last I checked, a shotgun was the best way to protect your home- it's a definite win win situation! Yes, Give me a shotgun when I have corals. I want to blast them with light! It just means you won't miss.
120 watts v. s. 90 watts for kessil? Not very much waste if you ask me.
Radion pro- 170 watts
hydra 52- 135 watts.

Yes, I've used a 6500k lamp to grow corals. Not pretty, but they grew well.
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