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Old 12/10/2016, 01:38 PM   #1
stan80
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6500k really the best for growth??

Is 6500 k really the best for coral growth? It doesn't look so appealing to my but i want whats best for my corals


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Old 12/10/2016, 01:43 PM   #2
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Just shoot for 12-14k and maintain water parameters and the corals will grow plenty fast. Aquariums are for our enjoyment and running a 6500k temperature reduces how much I can enjoy my aquarium. Some people do like the 6500k look and unless your one of those people just run 12-14k and enjoy the tank and give the corals time to grow.


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Old 12/10/2016, 01:51 PM   #3
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Nope. No one or nothing I have heard or read says 6500kelvin is a prosperous source of light for Corals. Maybe you were thinking for Macro growth in your Sump. In that case 6500 is the exact temp for that application.

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Old 12/10/2016, 01:51 PM   #4
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Anytime you can find a Reef Octopus 110 space saver buy it. You can always get a new pump for them and they fit into almost anywhere. IMO. They also do a superb job on smaller applications like what you and I myself have.
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Just shoot for 12-14k and maintain water parameters and the corals will grow plenty fast. Aquariums are for our enjoyment and running a 6500k temperature reduces how much I can enjoy my aquarium. Some people do like the 6500k look and unless your one of those people just run 12-14k and enjoy the tank and give the corals time to grow.

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Old 12/10/2016, 01:52 PM   #5
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Oops posted that on the wrong page.

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Old 12/10/2016, 01:52 PM   #6
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Well i have two 6500 bulbs with 1 14000 and 1 18000 k led strips but the tank still doesn't look very blue at all


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Old 12/10/2016, 01:58 PM   #7
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I have considered a 10k bulb. I use 20k now and it looks great for sure. But I tad slower growth.


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Old 12/10/2016, 02:00 PM   #8
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Well i have two 6500 bulbs with 1 14000 and 1 18000 k led strips but the tank still doesn't look very blue at all
T5/MH tends to drown out LED's easily. Also the whiter spectrum drowns out blues easily also. You are going to have to change bulbs if you want a bluer look. Most people run more blue bulbs/led intensities then white to acheive a 14k'ish look.


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Old 12/10/2016, 02:13 PM   #9
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Well i guess what i really want to know is the 6500 look isnt gonna harm my corals right?


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Old 12/10/2016, 04:11 PM   #10
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Well i guess what i really want to know is the 6500 look isnt gonna harm my corals right?
Probably not, but chances are you'll get a lot more algae growth.

In the wild, most corals are not exposed to 6500k light as the water filters out much of the spectrum. Hence why we look to imitate more of a 10-20k temperature in our tanks.

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Old 12/10/2016, 04:22 PM   #11
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Awe ok...but i do have like i said 14 and 18 leds as well but it still appears more 6500k in appearance


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Old 12/10/2016, 04:56 PM   #12
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Back in the 80's we could only get 6500k which is considered the color of the noon sun light. It wasn't till the early 90's that 20k bulbs became available. You can get growth and it doesn't hurt the corals. Now days hobbyist want to see the fluorescent colors of the zooxanthellae. Problem is that doesn't mean that a blue light grows corals just shows the zooxanthellae colors. One should choose a light to help corals grow and not because I "like " the color. We should always want to make the corals under our care as healthy as possible.


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Old 12/10/2016, 06:53 PM   #13
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Probably not, but chances are you'll get a lot more algae growth.

In the wild, most corals are not exposed to 6500k light as the water filters out much of the spectrum. Hence why we look to imitate more of a 10-20k temperature in our tanks.

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but the corals in the shallowest water are exposed to 6500k??


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Old 12/10/2016, 06:55 PM   #14
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They will not harm your corals. Most of the coral in our tanks came from depths where 6.5k is about right. They look yellow. They will grow the coral faster. They will bring out the true colors in your coral, but are not too good at showing them off. They have as much PAR as possible since they have output all the way IR in larger numbers than higher K sources.

Watt for watt, they will grow coral the fastest. However, you might enjoy more watts of a 10K bulb for a bit more color and still a ton of growth. Hamilton and XM 10k bulbs are quite nice and only need a bit of blue to make most coral pop.


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Old 12/10/2016, 06:58 PM   #15
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High noon with sunlight on the surface is about 5.5K. Down like 12-15 feet is 6.5K where most coral come from. Once you get pretty deep, 15-20K is more common - only really the thin branched deepwater SPS and NPS stuff come from here. Most of the AQ corals that are commonly available are in waist/neck high water between 5.5k or 6.5k.


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Old 12/10/2016, 07:07 PM   #16
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Ok, i reason i ask in first place was i went to replace a blue bulb but didnt have any left excpet a 6500k so i went with it....will that change in color shock the coral in any way? Especially if i again change the color by putting the old blue bulb back in ?


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Old 12/10/2016, 07:15 PM   #17
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Lower the photoperiod a bit - the extra output of the 6.5k can bleach the corals. Cut it in half. Ramp it back up over a few weeks. Going with lower output is nearly never a problem.


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Old 12/10/2016, 07:23 PM   #18
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IIRC the lower K lamps put out more power than higher K lamps. It might have been a function of the power more than the color.

Water does absorb light, but not near as fast as people think.


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Old 12/10/2016, 08:28 PM   #19
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IIRC the lower K lamps put out more power than higher K lamps. It might have been a function of the power more than the color.

Water does absorb light, but not near as fast as people think.




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red light is attenuated rapidly and does not penetrate further than about 5 m in clear water.
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Old 12/10/2016, 08:37 PM   #20
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The old lighting guide from Dr. Joshi that Manhattan Reefs used to host had very empirical evidence on output from a myriad of lamps and wattages. I cannot find it anymore - I would love it if anybody had a link. It could have showed you the difference in output between your two exact bulbs.


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Old 12/11/2016, 08:10 AM   #21
timnem70
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Read up on lighting and Reef keeping. This should be in the beginners forum.

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Old 12/11/2016, 10:04 AM   #22
ksc
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Nope. No one or nothing I have heard or read says 6500kelvin is a prosperous source of light for Corals. Maybe you were thinking for Macro growth in your Sump. In that case 6500 is the exact temp for that application.

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Maybe you could edit this out so no newbie actually believes this. I'll put a 6500 Iwasaki MH(it's actually a MV bulb) against any lighting system out there and
grow sps much faster.


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Old 12/11/2016, 10:15 AM   #23
jda
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Don't hate too much. Most of the Biocube Generation of Reefers (and beyond) don't know much unless BRS made a video about it.

While I would love to think that this is a beginner topic (and it should be), it is quite advanced for people whose introduction to reefing is the user guide to their Apex and whatever LED panel that they bought.


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Old 12/11/2016, 11:31 AM   #24
Greg 45
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m/h lamps

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Maybe you could edit this out so no newbie actually believes this. I'll put a 6500 Iwasaki MH(it's actually a MV bulb) against any lighting system out there and
grow sps much faster.
They don't sell this lamp any longer contacted the company , they now only sell the 10k.


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Old 12/11/2016, 11:53 AM   #25
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I have considered a 10k bulb. I use 20k now and it looks great for sure. But I tad slower growth.


Corey
When I ran T5's had 10k bulbs which allowed for the fastest growth ive ever had in my tanks. I think thats the sweet spot right there


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