![]() |
|
Portal | PhotoPost Gallery | Register | Blogs | FAQ | Members List | Calendar | Search | Today's Posts | Mark Forums Read |
![]() |
|
Thread Tools | Display Modes |
#21
|
|||||
|
|||||
![]() Quote:
Yep if you look at the ocean, where there is red light there is algae. Once you penetrate the ocean deep enough the "red" light is the first that gets filtered out. Hence after a certain depth...no algae's like there is towards the surface. In a tank it means nothing, our tanks are not deep enough to do this... I sorta think the spectrum claims of LED manufacturers admit of a bit of snake oil i'm afraid, rather their claims of perceived benefit...but again LED is relatively new...so time will tell.
__________________
I once had a Big tank...I now have two Huskies and a coyote Last edited by Pan; 02-26-2013 at 10:59 AM. |
#22
|
||||
|
||||
![]() Something I've read on other forums say that the full spectrum is not mainly used to improve growth. You can have a perfectly healthy and growing coral under just Blue and White LEDs. However, they pointed out that there are some other photosynthetic pigments in coral that will will peak at other light wavelengths. By giving those pigments the wavelength they peak at, they will supposedly show better color overall.
Not my opinion, just something I've read. I'm still trying to decide whether or not the Full spectrum is worth it for my next upgrade. Personally tho, I've had a few coral change color on me with my current T5s, some of them came from Blue/White LEDs, some of them came from T5s. So I'm not sure what to believe. |
#23
|
|||||
|
|||||
![]() Quote:
I am going to try a couple of LED pendants as sort of a spot lightning or highlighting effect....when i build the system as the pendants were free - so maybe I will convert. But the 'perceived" downsides to MH were never a problem for me. I have seen as many people in support of LEDS as there are people who went back to MH,t5 from LEDS - Choice is good and there is an abundance of choice in lighting. Many zooxanthellate corals have their bright colors because of a family of multi-hued fluorescing proteins. These pigments seem to be produced in response to a given light environment. The primary control on their production appears to be total irradiance level, and little evidence exists to suggest that the "k" rating of bulbs will influence their production. There is also a strong genetic component, although the specific aspects of fluorescing proteins and their respective genes have not yet been worked out. The color temperature of light bulbs most likely influences the perceived color of corals in a tank, with ultraviolet components enhancing highly fluorescent pigments. Certain bulb temperatures may have enough of their spectrum skewed in relative distribution that total irradiance with a given wattage may be affected, and thus total irradiance influencing the relative production of fluorescing proteins. Above COURTESY OF http://www.reefkeeping.com/issues/2003-11/eb/index.php - it is an older article, and indeed more may have been learned on the matter. http://www.nightsea.com/articles/publications/
__________________
I once had a Big tank...I now have two Huskies and a coyote Last edited by Pan; 02-26-2013 at 05:03 PM. Reason: And to think I was rambling more.....before the edit. |
#24
|
||||
|
||||
![]() Full spectrum is basically entirely for coloration.
Advanced aquarist has a good review on fluorescence, and fluorescent pigments in corals. This has been thoroughly discussed in scientific literature (and continues to be discussed). (http://www.advancedaquarist.com/2006/9/aafeature) If you guys take a look at figure 2, it highlights the broad spectrum of wavelengths (both visible and UV) that fluorescent pigments in coral cover--the more of them we hit with our light's emission, the more vibrant our corals look. In terms of growth, there are photosynthetic pigments that absorb into the visible as well (and even approaching the near IR... or well into the red), but the most common ones (the chlorophylls) absorb around the wavelengths that 'blue' and 'white' LEDs emit. http://reefbuilders.com/2010/08/23/c...nfrared-light/ The reason people switch back to T5 and MH light sources is because these lamps are broadband emission sources, so you're hitting both the growth wavelengths and the other visible wavelengths all with one lamp, resulting in growth AND pretty colors. LEDs are narrow band emitters (ie: they just hit specific bands), so including different colors of LED helps with color rendition. LEDs have other advantages; smaller fixtures, run cooler, use less power, long bulb lifetime, etc. As a guy who works on LEDs on the molecular level, I'm stoked about the technology. Sure there's room to grow, but people hanging onto MH and T5 systems may be a little afraid of change. ![]() |
#25
|
||||
|
||||
![]() Quote:
Quote:
Energy saved seems moot when every six months people seem to be upgrading ![]() Quote:
Again...I'm going to try LED again and see....especially if it warrants it after reading. But again, people are replacing their fixtures because itr is the newest thing, the newest thing is always pushed and "improved" periodically. Again, I am not as current with LED as you probably are, but It's not a mature tech yet....so again the developments will come rapid for the next little bit i would think. I must say i like the Aesthetics above the tank with the LED pendants...its the inside i worry about. I have Orphek Pendants and Kessil a350's the adjustable ones....having them hanging down over my rimless tank would look awesome...if they make the livestock look good then I'll not hesitate in switching. |
#26
|
|||||
|
|||||
![]() Quote:
White LEDs as I'm sure you know are a mix of wavelengths. So you can't say a pigment absorbs best at the wavelengths white LEDs emit, since they emit a very broad spectrum. |
#28
|
|||||
|
|||||
![]() No nothing at all wrong with them. Growth is great and color is good.
Unfortunately it seems lately any thread started with leds in the title attracts all the people with no experience with them to feel the need to tell everyone what's wrong with all LEDs.
__________________
225gal dt with 100g sump. Mitras, vortechs, bubble king, AI Sol and Profilux. http://www.canreef.com/vbulletin/sho...threadid=84782 Will trade subs for frags ![]() My other summer hobby: http://www.edkra.ca |
#29
|
|||||
|
|||||
![]() No, not even that. They're fine. If you stood in front of my tank, you'd agree they do a decent job with SPS.
__________________
Brad |
#30
|
|||||
|
|||||
![]() Haha my thoughts exactly. Well put. I like my Sols. Big learning curve and would buy them again.
|
![]() |
Thread Tools | |
Display Modes | |
|
|