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igadget56
01/02/2013, 10:31 PM
I know the higher the Kelvin the bluer the look. But what does Kelvin actually do for the growth and color of corals. I see some LEDs with 3.5K and 6.5K. Are these two LEDs used for coral growth and color or just appealing to the human eye. I know that actinic is 420, are there any 420 LEDs to be had. I would think 6.5k and3.5k would be pretty yellow, is that correct.

reefriot13
01/02/2013, 11:29 PM
Kelvin is the color temp the human eye see's. 65k being natrual daylight. 20k being deep ocean blue. Differant things use differant spectrums for growth and color pigment. Mixing diferant kelvin leds gives you better control of the desired color and growth. LEDs come in a lot of colors and yes there are 420 460 570 and so on.

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ghellin
01/02/2013, 11:46 PM
Kelvin is color temperature as stated above. While the 420 you referred to, is wavelength in nanometers. So actinic is listed as 420nm not 420K. Just trying to help clear that up.

igadget56
01/03/2013, 12:14 AM
Kelvin is color temperature as stated above. While the 420 you referred to, is wavelength in nanometers. So actinic is listed as 420nm not 420K. Just trying to help clear that up.

yes I was aware of that, but thank you. If actinic T5's make the coral color pop, why isn't there more used in a LED fixture. Do the 3.5K do anything for coral growth or color? Thank you, just trying to figure out what to do.

reefriot13
01/03/2013, 12:29 AM
Here's a layout of my LED set up. This will give you an idea of what color combos people use.
http://img.tapatalk.com/d/13/01/03/2ugajyde.jpg
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igadget56
01/03/2013, 01:53 AM
I see you only have 2 35K, I have 8. I do not have any 420nm You have 10k and I have12k. What do you think about me taking 4 of the 35K out and putting in 4of the 420nm. just a thought. Almost forgot, is there any place in the us where we can order them. $1.50 a piece isn't bad but shipping from China is $30. Again I appreciate your help thank you

reefriot13
01/03/2013, 07:13 AM
that depends on your brand of led. They all can be bought in the US. Your just gonna pay a little more. And 30 bucks for shipping is way off. I can get free ship from china just takes a month. So I'm assuming you have a fixture like that? You need to find out what brand of led you have. Mine are bridgelux 3w driven at 2w.
And yes the 420nm leds are very dim and hardly do anything by my eye. Now what they do for coral is a differant matter. If your wanting more blue then use royal blue. The 420nm is like actinic, the royal blue is like a blue+ T5
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igadget56
01/03/2013, 01:44 PM
Mine are bridgelux 3w driven at 2w.


Yes these are the ones I am looking for. Do you know someplace other than China
where I can get them. Would like to try some 420nm. Thanks again.