Question about new lights for a 30g planted tank - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 17 Old 09-19-2010, 07:44 PM Thread Starter
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Question Question about new lights for a 30g planted tank

I already have a light which I bought from the lfs. technically I told my mom to buy it for me cause of late night work. Any how the seller has sold her a 14watt or around that. Which is not enough for my tank. And its PINK
So with in this week I'm gonna buy a white Fluorescent light. I want to know how many watts should I buy for a 30g tank?
Also I donno if there is a special type of lights for aquariums, or just buy a X watt ordinary Fluorescent light from a hardware store?

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post #2 of 17 Old 09-19-2010, 09:53 PM
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if your going with plants a bulb rated at 6500K will work great...it should be listed on the side of the box or on the bulb...as far as watts go use what the fixture is rated for....

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post #3 of 17 Old 09-20-2010, 12:23 AM Thread Starter
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Originally Posted by badxgillen View Post
if your going with plants a bulb rated at 6500K will work great...it should be listed on the side of the box or on the bulb...as far as watts go use what the fixture is rated for....
You mean a tube bulb right?

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post #4 of 17 Old 09-20-2010, 12:27 AM
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yes

a flourescent tube..

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post #5 of 17 Old 09-20-2010, 09:30 AM Thread Starter
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Correct me if i'm wrong I read some where it should be 2-5watts per gallon for a planted tank. I just bought a 6500k 20watt 2ft bulb for my tank. I made the hood so I can always dissemble it and add more bulbs. So approximately I need 3 more bulbs.

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post #6 of 17 Old 09-20-2010, 10:38 AM
whoah that many why dont u get a 40 watts and use 2?

5x2x2 aro,highfin bat,fei feng,ST,albino tinfoil,c.perch
4x1.5x1.5 planted tetras,harlequins,
otto,WMM,2 types of celebes rainbows,rcs,amano, bamboo,red ramhorns,MTS
3.5x2.5x2 flowerhorn,pleco
3x1.5x1.5 russel's lion,blue cleaner,sixline and leopard wrasse,maroon clown pair,green chromis,scorpion,tiger cowrie,turbo,lyretail anthias,jewel,anemone,star polyp,marbled and giant green mushi,zoa
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post #7 of 17 Old 09-20-2010, 12:39 PM Thread Starter
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whoah that many why dont u get a 40 watts and use 2?
I thought I would do the same, but the guy at the store said there is only 20watt 2 ft bulbs available. He also said they dont manufacture those type? :/
I went to 2 harware stores they said the same :S

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post #8 of 17 Old 09-20-2010, 01:11 PM
oppss... so sorry they dint have those looks like your stuck with a lot of tubes

5x2x2 aro,highfin bat,fei feng,ST,albino tinfoil,c.perch
4x1.5x1.5 planted tetras,harlequins,
otto,WMM,2 types of celebes rainbows,rcs,amano, bamboo,red ramhorns,MTS
3.5x2.5x2 flowerhorn,pleco
3x1.5x1.5 russel's lion,blue cleaner,sixline and leopard wrasse,maroon clown pair,green chromis,scorpion,tiger cowrie,turbo,lyretail anthias,jewel,anemone,star polyp,marbled and giant green mushi,zoa
2x1x1 nano sw shrimps
22 May 2012
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post #9 of 17 Old 09-20-2010, 01:29 PM
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This may be out of control, let's back up a moment, before you spend unnecessary money and effort only to have to undo it later.

First, your tank; it is 30g and 24 inches (you mention a 2-foot tube) in length (or perhaps 30 inches)? Over this size tank, one full-length T8 tube will be adequate provided it is the correct type (more on this momentarily). The still-too-frequently repeated suggestion of 2-5 watts per gallon does not equate with reality and is quite false. You can get a fuller explanation of this issue in the series "A Basic Approach to the Natural Planted Aquarium" stickied at the head of this section, so I won't go into the details here.

A tube that extends full length across the tank, or close to it, is all you need. The length of tube (measured not including the prongs at the end) is what you look for when you buy a tube, so it will fit the fixture in the hood. Watts is irrelevant, as each length of tube comes in a standard wattage [though some manufacturers now produce tubes in less wattage as energy saving and they emit the same intensity of light] so you needn't be concerned over the wattage. The standard fluorescent tube is T8 or T12; the "T" is the tube diameter, T8 are thinner than T12 and are better light as they are more efficient. Most manufacturers are now moving to T8 solely, they are better.

Once you have the length, look for a full spectrum or "daylight" type tube. The kelvin rating is important, it is the colour of the light. A tube around 6500K is close to the mid-day sun and provides what plants need plus the natural colour rendition of fish and plants. The "pink" you mentioned is due to high red and blue with little or no green; it used to be said that plants grew better under this purplish light, but that has now been shown to be false. Not to mention the pinkish hue it gives the aquarium.

A hardware store will have daylight tubes made by GE, Sylvania or Phillips. If the K is around 6500K, that will work fine. This light will be sufficient for the majority of aquarium plants. Adding a second tube, i.e., doubling the light, is going to mean a higher level of balance between nutrients and light or algae will overtake your tank in no time. I would go with one tube. I have a single 30-inch tube over my 36-inch 33g tank (you can see it in the photos under my "Aquariums") and the plants thrive.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #10 of 17 Old 09-20-2010, 08:38 PM Thread Starter
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Quote:
Originally Posted by Byron View Post
This may be out of control, let's back up a moment, before you spend unnecessary money and effort only to have to undo it later.

First, your tank; it is 30g and 24 inches (you mention a 2-foot tube) in length (or perhaps 30 inches)? Over this size tank, one full-length T8 tube will be adequate provided it is the correct type (more on this momentarily). The still-too-frequently repeated suggestion of 2-5 watts per gallon does not equate with reality and is quite false. You can get a fuller explanation of this issue in the series "A Basic Approach to the Natural Planted Aquarium" stickied at the head of this section, so I won't go into the details here.

A tube that extends full length across the tank, or close to it, is all you need. The length of tube (measured not including the prongs at the end) is what you look for when you buy a tube, so it will fit the fixture in the hood. Watts is irrelevant, as each length of tube comes in a standard wattage [though some manufacturers now produce tubes in less wattage as energy saving and they emit the same intensity of light] so you needn't be concerned over the wattage. The standard fluorescent tube is T8 or T12; the "T" is the tube diameter, T8 are thinner than T12 and are better light as they are more efficient. Most manufacturers are now moving to T8 solely, they are better.

Once you have the length, look for a full spectrum or "daylight" type tube. The kelvin rating is important, it is the colour of the light. A tube around 6500K is close to the mid-day sun and provides what plants need plus the natural colour rendition of fish and plants. The "pink" you mentioned is due to high red and blue with little or no green; it used to be said that plants grew better under this purplish light, but that has now been shown to be false. Not to mention the pinkish hue it gives the aquarium.

A hardware store will have daylight tubes made by GE, Sylvania or Phillips. If the K is around 6500K, that will work fine. This light will be sufficient for the majority of aquarium plants. Adding a second tube, i.e., doubling the light, is going to mean a higher level of balance between nutrients and light or algae will overtake your tank in no time. I would go with one tube. I have a single 30-inch tube over my 36-inch 33g tank (you can see it in the photos under my "Aquariums") and the plants thrive.

Byron.
I see so I can stick to a single light then. Yes I bought a Phillips 6500k daylight bulb. Thank god I dont have to hassle with so many bulbs. Yeah the bulb which I have fixed for my hood is few inches longer than the tank. Right now I dont have a hood to cover the tank top, I will be building another hood this weekend so I wont be wasting any light.
Btw your tanks are amazing!

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Last edited by eguynth; 09-20-2010 at 08:41 PM.
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