Light movers

Bean, I was going to go the route of the stepper motor and the threaded rod, but it just became too much work and money to reinvent the wheel for me. This solution works fine for me. It'll be even better if my 2RPM motor is a direct bolt-on
 
I have been on the fence as well... but I want my controller to be able to run the thing. The back and forth is ok but just not what I am looking for.
 
I was wrong. With electronic ballasts you can do a 50% power and 100% power output with some complicated wiring.

Andy
 
Hahn, that would work. You can usually find them cheaper on ebay.

If you need a shorter rail, just cut it with a hacksaw, that's what I did. :)

If you're ever near Hartland, let me know and you can come see my tank at work.
 
The purpose for the light mover, for me at least, is to be able to use less lights over a longer area. In my case, I want to be able to use a single 250wattDE halide over a 4' long tank.
 
and what would that do for us? We are trying to do 2 things with a light mover:

1. use less lights: Using one or two lights where 3 or 4 might otherwise be needed.

2. cover a longer/larger area with the lights, related to #1 in a way.

The main idea is less wattage, less fixtures needed.

As an added benefit, many of the corals we grow respond well to the periodic light/dark cycling through the day. Some scientists have indicated that constant peak exposure throughout the day may be overkill, since it really only takes a brief photoperiod to stimulate the photosynthetic reaction which will then continue to work in the shadow even for some time. Constant peak exposure could actually lead to overexposure and photo-inhibition... stunting coral growth and coloration.

Another benefit is that with a moving light source, more of the coral's surface gets hit with light, so the intense peaks in the high-light zones and whitened spots in the shadowed areas isnt as common. The coral can color in better overall.
 
Is there any consensus on how many fixutres you need to service a certain tank length when using a light mover? I'm thinking of a 24" deep, 6' long tank. Would 2 250 watt fixtures be appropriate, or should I consider one with supplementary T5 lighting? I'm just starting to investigate light movers, so pardon me if its a dumb question.
 
No, that is a good question... a very good question really. The response is 'depends' though.

In my case, Ill be lighting a 48x30" tank with a single 250wattDE halide, so I will have an additional 4-6 54wattT5 bulbs running. So Im not going to have any 'dead spots' exactly. If anything, the halide is there to provide a 'peak' which comes and goes throughout the day to keep the light lovers happy.

If I was considering only the halides on the mover for a longer tank, like 6', then yes... I would most likely go with a dual inline light setup. I just couldnt go with having only 1/3 of the display lit up at any given time.
 
Hahn, I would answer, but I think I would say exactly what you just said. :)

I'm doing exactly that over my 40. There's a 4x39W T5 setup which is bright in itself (and I'm even using 54W program start ballasts on them, but I have no idea if they're actually overdriving the bulbs) and the 150W halide is just a nice "peak" spot like you mentioned. And it adds nice shimmer lines. :)
 
<a href=showthread.php?s=&postid=9053197#post9053197 target=_blank>Originally posted</a> by eameres
I do like the T5 plus single halide idea, very interesting...

Yeah, that way I dont have any 'dead' spots... as what isnt lit by the halide will just be bluer. Im not sure yet on how many T5s I will run, and that may determine what bulbs I use, but if I only do 4 bulbs, 2 will be blue+, and the other 2 will most likely be true actinic03s. If I can run 6 bulbs, then I might add a 3000K and aquablue to the mix... then I may not even need the halide though... who knows!!!
 
My light mover is an Agramover off of ebay, but the bracketing and stuff on it is all DIY.

halide3.jpg


bracket1%7E0.jpg
 
I'm currently running a light mover over my 200G holding tank and will be moving it to my 400G main tank when I stock it.

Currently I'm only running one 400W DE MH bulb on the mover. It's doing OK but I don't like the dark spots when the light is not at that end of the tank.

When I set it up on my 7' long 400 G tank I will be using 2 bulbs, spaced 3 feet apart. The mover will only move 3 feet so that each bulb only has to cover 1/2 of the tank. That way I'll get more light out of them into the tank.

On a side note, this tank sits on a west end wall with a south facing wall of windows. The tank will be lit mainly by Sun Light coming thru the windows. The 400W MH will be either 20K or 14K bulbs to add in the needed blue light as well as light the tank at night and on clowdy days.

As for your original question on a vertical mover, I don't think you will get the effect you were thinking of unless your moving the light a distance of say 5 feet or more in a vertical direction.
 
hey is that a Navy Chief or Chef :D I could use some good grub this afternoon.

I still think the stepper is the way to go. 1 slow cycle from left to right during the photoperiod. Sunrise, Sunset (DOH! now I got that STUPID "fidler on the roof" song in my head and want to shoot myself.)
 
Bean! Don't shoot yourself!!!







There's a long list of people here who I'm sure would be more than happy to shoot you. ;) There may be s single-file line behind StaticX.
 
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