what is the best plant light for a 20 gal tank? - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 21 Old 12-18-2007, 01:23 PM
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Ok. I'm not going to debate with you but ... let me ask you why did people than came up with this watts per gallon rule and how come it is sooo widely used?

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post #12 of 21 Old 12-18-2007, 02:19 PM
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I have actually tried putting 400 watts of lighting over a 10 gallon tank of regular light bulbs and got plants that melted away and turned into mush. A small bank of 4 light sockets with 4, 100 watt regular light bulbs with cone reflectors and actually had a huge amount of light, no growth but the tank was very bright.

I actually have well over 3 watts per gallon on my 10 gallon tanks right now and I can not grow the higher light plants and have rarely seen any reds that you get from actual high light.

You must have enough watts, proper lumens, and proper spectrum to grow plants. 6500 K or higher, a CRI as high as possible and the highest lumens possible. If it was not for this FACT then I could put 30 watts of standard incandescent screw in household bulbs over my tanks and grow plants as well as I could with 30 watts of power compact flourescents with the proper K, CRI and Lumens. If all you need is wattage then why not get nothing but actinic lights for fresh water plants? Because they will not grow plants!

Yes you have to have enough wattage but without the proper Kelvin rating, Color Rendering index and Lumens the light is useless.

The w/g "RULE" no longer stands alone as the standard for lighting.

http://woo.gotdns.com/Aquarium/Lighting.htm
http://www.rexgrigg.com/mlt.html

More and more aquarists are using the lumens/watt/square inch or LUX standards including Tacheshi Amano, Rex Grigg and Travis Simonson The watts per gallon rule simply does not work anymore all by itself. Example, for very high light you need 7.5+ w/g for a 10 gallon, for a 55, you need 4 w/g to achieve the same high light standard.

I hope this hasn't confused you teh13371, we just want to make sure you have the best chance of success at growing plants and get all the FACTS to do it right. Please ask as many quesitons as you need to to make sure you understand the whole thing, or at least as much as you need to.
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post #13 of 21 Old 12-18-2007, 03:15 PM Thread Starter
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ummm, i dont really understand any of this, but i really just wanted to know if anyone knows a good quality light for a 20 gallon tank. thank you for the info about watts, etc, and ill remember that for when i make a decision about a bulb

The first rule of Fight Club is - you do not talk about Fight Club. The second rule of Fight Club is - you DO NOT talk about Fight Club. Third rule of Fight Club, someone yells Stop!, goes limp, taps out, the fight is over. Fourth rule, only two guys to a fight. Fifth rule, one fight at a time, fellas. Sixth rule, no shirt, no shoes. Seventh rule, fights will go on as long as they have to. And the eighth and final rule, if this is your first night at Fight Club, you have to fight.
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post #14 of 21 Old 12-18-2007, 03:28 PM
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http://www.bigalsonline.com/BigAlsUS...esingle30strip

That light will serve your needs very well. If it is too long or too short, Big Als has a huge selection and there will be one that will fit your tank. It comes with a 6500K bulb so that is covered and the wattage is more than enough to cover most plant needs as well the lumens and spectrum needed. I know many keepers that use this light or similar ones over their tanks with great success.

Other than the lighting it is hard to tell you what might be wrong because without adequate light the plants won't show the typical symptoms of common deficiencies.
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post #15 of 21 Old 12-19-2007, 10:32 AM
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N/M I did my research and yes... watts per gallon no longer apply .... as tech has progressed since. But... it is difficult to measure how much light you need otherwise and WPG rule is usually is the one that people use because its kind of a nobrainer... more watts the better. In any case ... the more watts u have the safer you are if you not sure what kind of lighting to get because even if you have 3 to 4 watts per gallon it doesn't matter what spectrum you have ... plants will grow with that kind of intensity. So I guess Mr. Tech you were wright. 8)
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post #16 of 21 Old 12-19-2007, 02:57 PM Thread Starter
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would java fern and java moss be okay with my low-light, well, light?

The first rule of Fight Club is - you do not talk about Fight Club. The second rule of Fight Club is - you DO NOT talk about Fight Club. Third rule of Fight Club, someone yells Stop!, goes limp, taps out, the fight is over. Fourth rule, only two guys to a fight. Fifth rule, one fight at a time, fellas. Sixth rule, no shirt, no shoes. Seventh rule, fights will go on as long as they have to. And the eighth and final rule, if this is your first night at Fight Club, you have to fight.
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post #17 of 21 Old 12-19-2007, 03:14 PM
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Both Java moss and Java fern will grow in pretty much any light, including the incandescents. It will be slow but they should grow and survive.
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post #18 of 21 Old 12-20-2007, 01:57 PM
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Quote:
Originally Posted by Unrulyevil
N/M I did my research and yes... watts per gallon no longer apply .... as tech has progressed since. But... it is difficult to measure how much light you need otherwise and WPG rule is usually is the one that people use because its kind of a nobrainer... more watts the better. In any case ... the more watts u have the safer you are if you not sure what kind of lighting to get because even if you have 3 to 4 watts per gallon it doesn't matter what spectrum you have ... plants will grow with that kind of intensity. So I guess Mr. Tech you were wright. 8)
lol sorry but this is kind of hard.... its not as easy as throw 3-4wpg at a tank and everything will grow. the other stuff does matter.

wpg works almost as well as inch per gallon. thats why i am not a fan of all these rules people say.

i would only use fluorescent bulbs.... even if its not a planted tank.

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post #19 of 21 Old 12-20-2007, 06:47 PM
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hey I have a lighting question too...
What kind of bulb would make a planted tank look more vibrant green? ... for viewing purposes only (in addition to whatever light the plants need to grow).
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post #20 of 21 Old 12-21-2007, 03:16 AM
So, now that we thoroughly confused everyone. Here are some of the formuli that I used to work with every day for 12 years.


http://www.codale.com/reference/form...f%20-%20levels

Now, you know why I am the way I am.
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