There is absolutely no comparison between the 2 technologies presented. Metal halide is the very best representation of sunlight!
@dusk1947
Жыл бұрын
Here's my issue with this conversation: Tullio DellAquila took spectral references data, but little was done to prove any correlation. His claim (even in this video) was that UV provided some form of benefit which was only speculation. Yet, even after his tests, almost nothing supports UV providing a physiological benefit to coral. Even with spectral graphs, it's still wild speculation. Great LED's produce little to no UV. While Halides produce measurable UV. How's that useful information? There is abundant scientific data, journals, and text book articles which describe how proteinpigment complexes (photosynthesis and photosystems) work. I can (and have) look up the pigment complexes in zooxanthellae, and understand the spectral bands used by corals to create chemical energy. It's no surprise that bands in violet, blue and red result in coral growth. None of that information is hidden anywhere, it's posted by numerous organizations like NOAA, Berkley, University of Florida. We know how corals respond to changes is the visible spectrum. Yet, the amount of data showing UV (or infrared for that matter) has any benefit, is exceedingly slim. One could argue that there is nothing disproving UV is beneficial, which I would agree. But a lack of evidence, is not evidence in either direction. And the burden of proof rests on the individuals making the claim. I know that if I don't get UVB, then I will become Vitamin D deficient. UVB interacts with a protein in human skin known as 7-DHC. It's empirical fact under our current level us understanding. But I am not a coral. Nor do I have a photosynthetic symbiote. Likewise, I have kept reptiles in the past which require UV light. UVB stimulates the creation of Vitamin D3 which is require for calcium absorption. Again, robust evidence. But reptiles are not coral nor zooxanthellae. Oh, and UV has numerous data points showing how harmful it is to life. As an example , it creates thymine dimers in DNA that mutate and degrade nucleic acids leading to everything from cancers to sterility. That's why intense UV is used to sterilize. Here's the issue: A large and growing number reefers keep healthy, thriving coral in complete absence of UV light. Including a large number of professional coral aquaculture facilities. The conservationists and researchers who raise coral spawns for the Florida Reef Tract restoration project, sexually propagate coral in absence of UV. There is nothing showing it's beneficial, and we already know UV isn't required. Now I'm not arguing that LED, T5, or Halides are better or worse at growing coral. And I won't judge esthetics on any tank but my own. The best light, is open sun in the ocean. All of our lighting technology has limits, and all three have proven track records in growing coral. What I'm asking for is: where does the hobbies fixation on UV come from? What evidence exists to support it? Other than anecdote, suspicion, and feelings. Tullio showed certain fixtures can produce UV. He in no way, shape, nor form showed UV was of any use to any organism in your tank or anyone else's. That's the counter argument to the UV debate. I think the discussion is useful so longs as false claims aren't made. Because we really can't answer either way, as science has yet to really study this topic (along with a host of other reefing related suspicions). Just speaking personally as another coral hobbyist: I don't want fixtures that produce UV. It's a wasted spectrum until something shows UV has some kind of benefit. Which I'll believe when I see data...
@PoloReef
Жыл бұрын
it doesnt agreed. just widens spectrum a bit and white leds have lots of blue and while not bad , on higher pars they have more tendency to fry coral than halides or t5. we are using a 2 hr white led cycle in am with heavy blues and they go off and halides take over from 12 to 4.
@Jay-uy2fj
Жыл бұрын
As a neuroscientist who focuses in neurochemistry, and a hobbyist for over 5 years, I could agree more everything you just said! It's nice to see someone asking real questions that cut through the hobby marketing/propaganda!
@telegraham
Жыл бұрын
Great comment, Dusk194. More data and less dangle.
@zulu09
4 ай бұрын
Sounds like a bunch of cope and I dunno 😂
@tobymilo8625
Жыл бұрын
Wether you agree or disagree with the content polo reef is out to educate and help the reefing community in my opinion. They always share their experiences and knowledge with us. So many people on social media are out to sell everything! But not them.These guys do it for the love of the hobby and for reef conservation. I’ve been watching for a long time and I have learned a lot. Great conversation and I hope you continue to share your experiences with us.
@fletcherwright7042
Жыл бұрын
Thanks for sharing 👍
@carlosthereefer
Жыл бұрын
Terrific discussion Andrew and Rachid, thanks as usual for all you do for the hobby. On a side note, THAT is definitely a "solid wall of sound". Would love to see an episode that shows off your sound system! 😊😊😊
@jackson6745
Жыл бұрын
Back in the day when I ran PFO DE 250w pendants, I remember having to have that glass shield in or it would burn the corals? SE glass covering filtered out excess UV out if I remember correctly?
@PoloReef
Жыл бұрын
yes
@oldschoolnewventure845
Жыл бұрын
love the fkin sound system Andrew
@jackson6745
Жыл бұрын
Does T5 put out UVB?
@bthefountain
Жыл бұрын
Super interesting hearing some of the behind the scenes conversations with tullio!
@SkyHigghReef
Жыл бұрын
❤❤❤❤❤
@christophercourtemanche1945
Жыл бұрын
Killing it guys!
@brianredban9393
Жыл бұрын
The guy definitely goes all out on his hobbies
@russeladams2003
Жыл бұрын
Tullio's measurement video was an infomercial at best. No real science was presented. Correlation does not imply causation. Until you show us why UV is important, it will just be a mind story. Why is UVB important when it is filtered through water? By making claims of the amount of UV, other than showing the graphs, and seeing representation in the graph have you actually measured the amount of it relative to the other wavelengths and compared how much of the light is actually in the UV range? Until you don't talk numbers, at best, you're just telling a mind story.
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