Have I worked out my watts per gal right? - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 07-18-2012, 02:09 PM Thread Starter
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Have I worked out my watts per gal right?

I have a choice between 4 and 6 bulbs ( 3 units with x2 bulbs on each ), each bulb is a 54w HO T5 and 5000lm per bulb.

My tank is 48"x24"x30" ( lwh & 124 imp gallons - 149 US gallons ) I also have a sump but have not included that in my calculations as the light is only directed into the tank, should I also inc the sump volume?

I have worked out that x4 would create 1.74wpg and x6 being 3.48wpg is that right?

Also what plants would the lighting suit, high-medium-low light plants?

Thanks
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post #2 of 10 (permalink) Old 07-18-2012, 02:16 PM
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The Watts Per Gallon rule is outdated and doesn't apply to the type of lighting you're using. PAR data is the current standard and tons of information about it is available in this Lighting Sticky.

Without more information about your specific light fixtures, it's tough to tell for sure what level of lighting you have. Maybe low-medium with one fixture and a really good reflector?

Someone else will definitely chime in but in the meantime, it's a good idea to check the lighting section out.


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post #3 of 10 (permalink) Old 07-18-2012, 02:21 PM
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Also, you would be wise to figure out what plants you want first, then pick your lighting accordingly.
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post #4 of 10 (permalink) Old 07-18-2012, 02:24 PM Thread Starter
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Thanks SWS, from what I have looked at most are low to medium light but the higher light mosses will be attached higher up in the tank for maximum light.
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post #5 of 10 (permalink) Old 07-18-2012, 03:26 PM
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That aquarium is 30" high. Is that right?

Standard 10 Gallon (20 x12x12).
Low tech, Sand substrate.
Eheim 2211, and Aqueon Quietflow 10.
Finnex Stingray LED, 20" above substrate
2 Anubias Nana Petite, Christmas moss.
4 Halequin Rasborahs, 5 RCS.
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post #6 of 10 (permalink) Old 07-18-2012, 03:31 PM Thread Starter
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Yes that is right, 30 inches / 76cm / 760mm high lol
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post #7 of 10 (permalink) Old 07-18-2012, 03:34 PM
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I'd probably go with four bulbs. Maybe three if The reflectors are really good quality.


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post #8 of 10 (permalink) Old 07-18-2012, 03:35 PM
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If you have very good reflectors, then 4 of them would be very high light. 6 would be to much. If no, or poor reflectors, you could probably get away with 6 of them. Look at the charts here before you decide:

https://www.plantedtank.net/forums/sh...d.php?t=105774

Standard 10 Gallon (20 x12x12).
Low tech, Sand substrate.
Eheim 2211, and Aqueon Quietflow 10.
Finnex Stingray LED, 20" above substrate
2 Anubias Nana Petite, Christmas moss.
4 Halequin Rasborahs, 5 RCS.
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post #9 of 10 (permalink) Old 07-18-2012, 03:43 PM Thread Starter
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Ok great thanks guys. I had a look at the PAR guide sticky but could not figure it out.

One more thing, would that light ( x4 ) be too intense for floating plants or Aponogeton and
Nymphaea species when the leaves reached the surface?

The lights will be approx 8 inches above the surface of the water.
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post #10 of 10 (permalink) Old 07-18-2012, 07:08 PM
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The tank is 30 inches high, with the light 8 inches above the tank. Assuming 3 inches of substrate, the light will be 35 inches from the substrate.

The tank is 24 inches front to back depth, and one T5HO bulb cannot light up that large an area anywhere near uniformly. So, multiple bulbs will be needed, separated by about 8-10 inches so the light from one bulb doesn't mix much with light from other bulbs. If you used 3 bulbs, separated by 8 inches, each bulb would have about 8 inches of substrate to light, which is reasonable.

A single T5HO bulb Catalina Aquarium light will give about 25 micromols of PAR at 35 inches. A single T5HO ATI light fixture bulb will give about 20 micromols of PAR at 35 inches. So, unless you want low light, you will need 2 bulb light fixtures, 3 of them, 8 inches apart, 8 inches above the top of the tank, for 40-50 micromols of PAR, medium light.

If you don't like the idea of having to set up and adjust 3 different light fixtures, you could get Catalina Aquarium to make you a custom light with 3 groups of 2 bulbs, with the groups separated by about 8 inches, using this http://www.catalinaaquarium.com/stor...oducts_id=1820 as a starting point.

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