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Old 07/08/2018, 12:38 PM   #201
Sisterlimonpot
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Quote:
Originally Posted by chris o View Post
Have you considered using a pair of track actuators like these.

http://www.firgelliauto.com/products...track-actuator

I used a pair of them to raise and lower my light rack about 35 inches. They have them up to 60 inches. You could rig one on each side. You can wire them to one controller.

Chris
unfortunately those actuator don't fit my needs. I decided to go with a stepper motor and a screw mounted in the center. I have to acquire all the components but once I do I will get started on it.


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Old 07/09/2018, 08:18 AM   #202
halmus
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Post lots of pictures as you build it out! Looking forward to see your robo-hood come to life.


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Old 07/10/2018, 12:29 AM   #203
lpsouth1978
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When I had my 300 we built a custom LED light and used a winch and rail system to move the light up and down. Because the winch was built for vehicle (12 volt) use, we used a motorcycle battery connected to a battery tender to power it. It worked great and even had a little key fob remote to operate it.


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Old 07/11/2018, 12:17 AM   #204
NVfishman
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light rack looks good. I downsized and just got a new 300gallon 8ft 24x 30 wide do u think you need 8 radion fixtures? i was getting rid of metal halides and thought i would get away with 4 radions what do u think?


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Old 07/11/2018, 12:50 AM   #205
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Old 07/11/2018, 11:51 AM   #206
Sisterlimonpot
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Originally Posted by NVfishman View Post
light rack looks good. I downsized and just got a new 300gallon 8ft 24x 30 wide do u think you need 8 radion fixtures? i was getting rid of metal halides and thought i would get away with 4 radions what do u think?
Thank You! My tank has the same dimensions as yours. The choice for 8 XR30's was 2 fold, I wanted to try as best as possible to distribute par evenly throughout the tank and eliminate light hot spots. My lights are 9" off the surface and roughly 19" apart on center (8" between each unit). Having 8 allows the lights to interact with each other giving more consistent par levels and will allow the lights to run at a lower overall intensity and hopefully prolong life expectancy.

With that being said, with every channel at max and overall intensity at 100%, the par levels of these Gen4 Pro's are off the charts. I have no doubt in my mind that 4 of these would be plenty for an SPS tank. Although when considering light distribution and Ecotech's recommendations of one XR30 covering a 24"x30" footprint at 9" off the water , you're right at the edge of their recommendations and may have low light areas in between each unit. I personally would still orient them lengthwise, although, you may consider mounting them turned 90 degrees front to back as well as raising them up to 11" to get better color distribution as well as even par.

Are you on the fence about wanting to get more? or is 4 your limit?


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Old 07/12/2018, 06:10 AM   #207
McPuff
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Quote:
Originally Posted by Sisterlimonpot View Post
Thank You! My tank has the same dimensions as yours. The choice for 8 XR30's was 2 fold, I wanted to try as best as possible to distribute par evenly throughout the tank and eliminate light hot spots. My lights are 9" off the surface and roughly 19" apart on center (8" between each unit). Having 8 allows the lights to interact with each other giving more consistent par levels and will allow the lights to run at a lower overall intensity and hopefully prolong life expectancy.

With that being said, with every channel at max and overall intensity at 100%, the par levels of these Gen4 Pro's are off the charts. I have no doubt in my mind that 4 of these would be plenty for an SPS tank. Although when considering light distribution and Ecotech's recommendations of one XR30 covering a 24"x30" footprint at 9" off the water , you're right at the edge of their recommendations and may have low light areas in between each unit. I personally would still orient them lengthwise, although, you may consider mounting them turned 90 degrees front to back as well as raising them up to 11" to get better color distribution as well as even par.

Are you on the fence about wanting to get more? or is 4 your limit?
While I do think that 4 units would light the tank sufficiently for SPS you'd have a good deal of shading and certain areas of the corals will not have the color you desire. Further, you'd want to concentrate your sps in the very middle of the light column for optimum condition. With 8 units you'd have terrific coverage, little or no shading, and uniform color on your corals. Besides that, you could place them anywhere in the tank and they would thrive. You could also run the units at a lower intensity. Lighting is definitely the major downside, in terms of cost, for running larger tanks.


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