lighting most bang for the buck? - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 19 Old 03-26-2013, 07:33 PM Thread Starter
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Just looked. Cant find 48inch. It is 18 deep
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post #12 of 19 Old 03-26-2013, 08:35 PM
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75g 48 long

Last edited by Reefing Madness; 03-26-2013 at 08:38 PM.
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post #13 of 19 Old 03-27-2013, 08:36 AM
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Just looked. Cant find 48inch. It is 18 deep
At 18" deep, you could essentially get away with a four bulb T5HO fixture. You can probably get one for about $200. I like http://www.amazon.com/Current-USA-Extreme-Aquarium-Lighting/dp/B004ZRFT00 but these do not have lunar lights. Brands such as http://www.amazon.com/Coralife-Aqualight-Output-Fixture-48-Inch/dp/B0049PU8BI/ref=cm_cr_pr_sims_t and http://www.amazon.com/Aquatic-Life-4-Lunar-Aquarium-48-Inch/dp/B0030VD4OU/ref=sr_1_9?s=pet-supplies&ie=UTF8&qid=1364387885&sr=1-9&keywords=48+inch+t5+ho+aquarium+lighting make units with Lunars, but you will pay for it. I have never used either of the latter two brands, but reviews seem decent on Amazon...

In a 75 gallon, 216 watts gives you roughly 3 watts per gallon. I have never been a fan of "watts per gallon" since it is all about light penetration and different tanks have different heights, so watts per gallon doesn't really work.

I always used a formula that comes to a penetrating wattage of at least a 1/4 watt per depth inch. I take the wattage and divide it by tank length (216w/48"=4.5). I take that result and divide it by the depth (4.5watts per length inch/18"=.25). This comes to a 1/4 watt per depth inch.

For illustration purposes, a 72", 3 x 250w HQI has 750 watts of light over a 150 gallon tall (72" L x 18" W x 28" D) would end up with .372 (about 3/8) of a watt per depth inch (750/720=10.4/28=.372). So in my estimation, getting that wattage to somewhere between .25 and .4 for a reef tank will help the animals thrive in this closed enviroment.

Rememeber too that different lights have different wattage power. HQI (metal halide) penetrate much better than T5HO and LED. Good LED's can penetrate better than Flourescents. I have owned every kind of light fixture and prefer LED the most. I hate replacing bulbs every six months...



Nothing good happens fast in an Aquarium

My 30 Gallon Long Marine Tank
My son's 20 gallon FW Community
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post #14 of 19 Old 03-27-2013, 10:02 AM
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^I forgot to add that the formula I used above does not apply to LED lights, since they are usually quite low wattage for the light they provide. For LEDs, it is all about quality of the LED and I believe a rating called PAR, which I am not sure how to convert it to a general rule of thumb...



Nothing good happens fast in an Aquarium

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My son's 20 gallon FW Community
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post #15 of 19 Old 03-27-2013, 03:58 PM
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Originally Posted by bohmert View Post
Just looked. Cant find 48inch. It is 18 deep
Forgive me please for questioning your tank measurements but I have 2 x 75 gallon tanks...
They are 48" long x 18" wide x 21" deep.

Are you sure you have measured right? Just checking since mods/members are quoting lighting for you, they need the correct height.

Every kid, regardless of what they are going through, is ONE caring adult away from being a success story. ~ Josh Shipp, Teen Behavior Expert
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post #16 of 19 Old 03-30-2013, 02:36 PM Thread Starter
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post #17 of 19 Old 03-30-2013, 03:21 PM
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post #18 of 19 Old 03-30-2013, 05:32 PM
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This looks good. LED lunars and a timer. Good buy.



Nothing good happens fast in an Aquarium

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My son's 20 gallon FW Community
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post #19 of 19 Old 03-30-2013, 10:05 PM Thread Starter
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Yep had some good help!!!!!
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