Big Tank. Big Lights. Need Advice.

FreakIndeed

Yo yo yo!
Oct 7, 2006
233
0
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47
Columbus, OH
I and some helpers are currently remodeling a building to serve as my new home. It will also be production studios for a non-profit children's educational tv show (I'm the media director and full time volunteer).

We are building a divider wall that divides the entrance of one tv studio from a foyer. We are putting in an approximately 400 gallon acrylic tank that is to be seen from both the foyer and it is actually part of one of the studio sets on the other side.

We debated between saltwater and a freshwater planted tank. Everyone and their brother has saltwater tanks in their tv sets, so we decided to go fresh and planted.

While the installation of the tank is still several months away, we are getting ready to run the electric to the area. So we need to decide what kind of power we are going to need. So me being the fish guy, have the responsibility to decide what lighting we will be using. I need your advice!

Tank is custom acrylic, measuring 84" long, 34" deep and 30-32" tall. It will be heavily planted with a range of plants. Of course we will be adding Co2, ferts and whatever else is required (you'll be seeing quite a few more posts from me about these things as we progress).

What lighting do you plant experts recommend? Metal Halide? Rows of Compact fluorescent? We are not set on any one particularly. But we need to view the overall picture of initial cost, bulb replacement and energy used to run.

We would like a relatively even light as it will be used on tv and dark spots may not look so swell. Because we are non-profit kid oriented, cost IS an issue. We would like to do this just as cheap as possible but are willing to raise what we need to raise to do the project right. Lights can be as ugly as heck, they are all hidden in the wall... so style is not an issue.

In case it matters at all, tank will house Discus, Angelfish, array of Apistos, several large schools of tetras, and lots of cories.

C'mon, I'm looking for some free advice. ;) Of course I'll post pictures as we go along!
 
You'll get good advice and lots of opinions here on the forums but with a tank this size, and this being a business, I would recommend getting a pro in there ASAP.

They can provide experience and professional help you need to get this setup right and managed without the mistakes that come learning these things the hard way by spending the money. Expect to pay around $4000 - $5000 dollars on this tank getting setup in addition to the cost of the tank.

My opinion getting a pro is the cheapest way to to do this.
 
Compact fluorescent is the way to go for three reasons: less heat and less cost to operate and less cost to replace bulbs. I'd suggest either going with the GE 9325K bulbs for a pleasing spectrum. You should be able to buy case lots of these bulbs relatively inexpensive.

You could go with HO or VHO, but I suspect that your cost initially is going to be much higher for electronic ballasts.

The tank is right at 400 gallons and with the extra depth you'll most likely need more than the 3 wpg rule. I'm guessing at least 4.5-5, but someone like Rex could give you the calculation in Lux per inch I think which is a better guide.
 
Our example here is going to be a 125 gallon tank. It's pretty much well known that if you hit 3 wpg on a tank this size you can grow anything.
http://www.rexgrigg.com/mlt.html

you prob will want a combo of MH and CF. never used MH before. i was just runing some numbers. 84 inch long you could line up 3 55w lights in a row. if you put 3 next to each other thats 9x55w which is only 495. you prob want more light then that.

its hard for me to say much because i never had a tank that big. good luck.
 
You don't want to apply the wpg rule to larger tanks because larger tanks require LESS WPG than those in the 20-100g range. I can't say how much because the largest tank I've worked with is 180g but you don't need 3wpg in a tank that large.
 
[FONT=Trebuchet MS, Arial, Helvetica]Each reflector in a 55watt Bright Kit™ is 22 inches long, 4 inches wide and 2 inches high

Think outside the box you could put 20 of them in a row. ||||||||||||||||||||
Pretty expensive for 1100 watts though. $630 plus about $300 for 9325K bulbs
or
http://www.opentip.com/products/X_W_Hid_Mh_Retrofit-653927.html
3x 400watt 10000K MH $673.20 including bulbs

I don't know what your HO and VHO options would be, but that's a possibility too.

Or maybe a combination.

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being a studio, you should look into dimmable flourescent options. In my experience, bright lights on set can be problematic.

also, you should do camera tests with whatever light temp you choose, my coralife 10000k bulbs make my dv cam go nuts... the 6500k ones don't. you cameras probably operate at a different rate.

don't forget to factor in fans.
 
T-5 with good reflectors.

Lower cost to operate
More lumens/lux per watt
More bulb options
Longer bulb life (12 - 18 months minimum on a reef - longer for plants)
Little to no heat issues

Here are a couple of retrofit kits (since I assume you're doing a built-in hood)
http://hellolights.com/index.asp?PageAction=VIEWPROD&ProdID=1369
http://www.premiumaquatics.com/Merc...oduct_Code=SL-960090&Category_Code=SunlightT5

Go with 6 or 8 sets. DON'T get the single reflector for a group of bulb option - T-5's work best with each bulb having its own reflector.
 
This sounds like a fantastic project. If you were in Cleveland I would volunteer whatever I could. I'm assuming this is being done in Columbus? I can still offer to drive down to Columbus at some point to lend a hand and/or consult (you probably have plenty of those though) if you are interested.

I can't imagine that you would want to use MH in a studio/set as they may have to remain "open" to dissipate the heat. And if you enclose them in a hood in addition to being behind the wall, you could cook your tank and overheat the fixtures. Even with CF's you will likely need to consider cooling (fans), especially in a hood.

Since you mentioned this will be behind a wall, I would suggest a hanging/mounted rack for suspending the lights. Being able to raise/lower this suspended system would be highly beneficial as well, and could be done without too much extra effort/cost. Maintenance will be required often, so ease of access is key. And you don't want floaters or sinkers showing up as guest stars because no one wanted to "climb into the wall" to scoop 'em out.
 
T-5 with good reflectors.

^ What I'd look at first too. ^

Ballasts are ballasts. No matter what system you use, there are going to be ballast costs associated with it. Even if you stuff the canopy w/ T8 NO vitalites, the number of cheap magnetic ballasts required to get adequate light would rival the cost of a comparable number of electronic ballasts for PC or HO T5 bulbs (but the electric bills would kill you on magnetic ballasts).

With a 34" span, I too started about going the other way with a lot of T5/individual reflector sets. The only problem is that the tank is going to be acrylic. I think that it can be damaged over time w/ UV exposure and that it is not as transparent to plant-critical wavelengths as glass is. If that is the case, centering wide-angle reflector high watt MH pendants over the holes, or using high wattage reef-ready combo fixtures w/ 6700K bulbs may be the way to go.

If I were you, I'd PM Plantbrain and see if he'll offer you any advice.
 
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