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has anyone used these lights?
- Thread starter THE WOOKIE
- Start date
I would have to disagree. Please post some supporting studies (I'm genuinely interested) ... Cree is known to be more efficient, as well as more consistent. Does it matter? That's up to personal opinions and corals that one is keeping. But from all the research that I've done, Cree is still better than all others.
That is according a source oversea who is working for Philips.
FWIW, the same source brought up an issue for my consideration which I can not say for sure if it is valid.
Most continuous spectra are from hot, dense objects, such as the sun. The continuous spectrum from these kinds of objects is also called a thermal spectrum, because hot, dense objects will emit electromagnetic radiation at all wavelengths or colors.
The white light from sunlight has a continuous spectrum.
The white light from LED is a blend of several narrow spectrum bands to trick human eyes to precive white light
So, in theory, to mimic sunlight, one need to group a lot of LED with overlapping spectrum, not just adding a green and red LED.
FWIW, the same source brought up an issue for my consideration which I can not say for sure if it is valid.
Most continuous spectra are from hot, dense objects, such as the sun. The continuous spectrum from these kinds of objects is also called a thermal spectrum, because hot, dense objects will emit electromagnetic radiation at all wavelengths or colors.
The white light from sunlight has a continuous spectrum.
The white light from LED is a blend of several narrow spectrum bands to trick human eyes to precive white light
So, in theory, to mimic sunlight, one need to group a lot of LED with overlapping spectrum, not just adding a green and red LED.
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I won't comment about the validity of Bridgelux == Cree, because I really would need to see proof. Again, I'm using Bridgelux fixtures myself, and not saying they're trash -- all I'm saying is, Cree is still best unless I see some legit studies done.
Regarding the second point, yep -- I'll buy that. But then again, I don't think there's anything human made (yet) that can 100% mimic the sun. But at the same time, not all wavelengths in the suns light are used by corals; in-fact, a lot of coral that look like crap in the wild, form their best colors under man-made lights (since a lot of corals change colors under aquarium light). Adding the green, red, uv, etc leds give the extra spectrums that will help corals maintain their colors to a certain degree.
Some basic about LED:
Light Emitting Diodes (LEDs) work based on the principle of excitation of free electrons in a semiconductor material. The spectrum from any electron or an atom is a line spectrum. And so LEDs obviously give line spectrum and not continuous spectrum.
Common white LEDs are just red and green and blue LEDs combined into a single package. Since LEDs have a "very" strong chrominance peak for their color design, this means a relatively poor CRI rating.
Light Emitting Diodes (LEDs) work based on the principle of excitation of free electrons in a semiconductor material. The spectrum from any electron or an atom is a line spectrum. And so LEDs obviously give line spectrum and not continuous spectrum.
Common white LEDs are just red and green and blue LEDs combined into a single package. Since LEDs have a "very" strong chrominance peak for their color design, this means a relatively poor CRI rating.
Sure again as I mentioned myself, "Adding the green, red, uv, etc leds give the extra spectrums that will help corals maintain their colors to a certain degree." -- I'm not claiming LED fixtures now-a-days can mimic the sun. There's a very valid reason why I recommend (and use) fixtures that make use of bulbs of different colors; the exact same reason you mentioned yourself -- "So, in theory, to mimic sunlight, one need to group a lot of LED with overlapping spectrum,".
All that being said, the colors of corals will morph under any light, with light not being the only reason for the morphing. By adding the extra color bulbs, you're helping fill in some of the missing spectrums from the LEDs that corals need to retain their colors. I am confident that my LED fixtures that I use can grow, and maintain coral colors, and I will prove it with my studies that I'll be running.
As much as I hate to run a MH, if there's a popular demand, I'll mount a MH over one of my bins, put exact same corals under MH as well as LEDs, and we can track the growth and colors after a month or 2 months. Based on the growth, colors, running costs, etc, we can come to a conclusion whether today's LEDs are a good replacement for MH or not.
Hate to add comic relief to a serious discussion, but just because Sun isn't a giant LED, doesn't mean LEDs can't grow corals 
Greenstreet.1
Non-member
Ok back to the group buy evergreen made the lights rb is just selling them same lights. Now are you doing the group buy if so will like to get in. Will like to know if I can custom the light will pay the difference.
jefstathiou
Non-member
Responded to Greenstreet via PM. Anyone else interested. There are now 2 folks. Trying to do this through reefbreeders, rather than ordering from China!
Comic relief is good.
I think current LED can grow many types of corals but will have difficulties with many other types without improvement of spectrum.
OP
OP
THE WOOKIE
Just Keep Swimming
i am planning on adding two 48" t-5 bulbs on my tank and run 2 pure actinics to supplement. think this is a good idea? might try the fiji pink
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