Agree on that. It is also dependant on what kind of plants do you have in there.
For a tank of that size , considering 2.5wpg, Please go for about 175 Watts of light.
Thats an approx figure.
Just to give you an idea.
I have 36W X4 6500K lights on my tank (48LX18WX18H) .
But I would love to change it to following.
36W 1NO 4000K front
36W X 2 6500K mid
36W X 1 800K back
Joined: Jan 12, 2006 Posts: 979 Location: Bangalore
Posted: Wed Sep 19, 2007 11:50 am Post subject: Re: 40 Watts, 12000 Kelvin, 2320 Lumen lights for planted ta
Hi DJ Rocky
Sorry for the late reply hopfully this info will still help you.
Whats the lumen rating. Lots of people asked me about Lumen. They said that they need more lumen capacity lights.
Lumens are a measure of light to the naked eye. Apart from the visual effect the lumens of the lamp are not the ONLY critical figure for lights in the tank. What counts along with it is the kelvin rating, CRI of the lamp.
This brings me to the next question 12000k lamps for planted tanks I would recomend you keep the range in 4000k - 8000k. 12000k lamps will be ineffective as compared to lamnps in the above mentioned range.
Placement of the lamp should be in this order from the front of the tank to the back 8000k - 6500k- 4000k - 6500k assuming you are going for a 4 lamp setup.
& suppose I am using the same 12000 k lights on the same tank, What will be its effect?
The effects of this kelvin range firstly is the blue tinge it will create in the tank it will not be visually appealing in a planted tank setup. The usable light by the plants are in very low ratios in a 12000k lamp. Hence making it far less effective than a 8000k lamp.
Joined: Jun 29, 2003 Posts: 7087 Location: Bengaluru, India
Posted: Thu Jun 04, 2009 9:01 am Post subject: Re: 40 Watts, 12000 Kelvin, 2320 Lumen lights for planted ta
Ron you want to grow plants you aim for 3-4 wpg and CO2 injection for tanks upto 3 x 1.5 x 1.5.
Larger tanks you can make do with the lower end of the scale. My 5x2.25 x 2 feet tank has 3 x 150 watt MH + 4 x 36 watt T8.
That's 594 watts or nearly 4 watts per gallon. On this large a tank it's very high light.
My other tank 2.25 x 1.5 x 1.5 has 1 x 70 watt MH + 2 x 24 watt T5HO. That's again 4+ watts per gallon.
It all depends on what you want to grow and how fast you want to grow them, and how good you can handle the setup.
For your fish only Cichlid setups, I would not exceed 2 x 36 watt T8 for a 4 x 1.5 x 1.5 tank. More light is lots of trouble with algae in the absence of Plants and CO2. MH in Cichlid tank - hmmmm........ cry within a month's time. BTW Plants and most Cichlids don't go together.
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