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Old 10-09-2007, 10:24 PM   #1
bwagner
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Too Much Light?


I was thinking of upgrading from my 4 x 55/65W CF on my heavily planted 120-gallon tank (48 x 24 x 24) with an additional 2 x 250w MH (double ended) lights.

Do you think that will be too much light? If not, what would you recommend for the MH bulbs 10K, 15k, 20K? And what brand bulbs would you recommend?
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Old 10-10-2007, 05:46 AM   #2
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It depends on how close the lights are to the tank. 250w MH lights will be way to bright unless you raise the lamp well above the top of the tank.

I think you'd be find with 2x150w MH lights and you'd also save on electricity.
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Old 10-10-2007, 01:02 PM   #3
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Quote:
Originally Posted by bwagner View Post
I was thinking of upgrading from my 4 x 55/65W CF on my heavily planted 120-gallon tank (48 x 24 x 24) with an additional 2 x 250w MH (double ended) lights.
Do you mean that you want to add 2 x 250 MH in addition to the PCs? That sounds like a really bad idea. If you want to replace the PCs with MHs, that would be okay if you're prepared for really high light and fast growth.

If you do that, I'd stick with Zoidberg's recommendation and use 150s. As for color temp, anything above 10K or 12K looks too blue in my opinion. I think ADA makes 8K MHs that look nice.
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Old 10-10-2007, 01:46 PM   #4
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Quote:
Originally Posted by bwagner View Post
I was thinking of upgrading from my 4 x 55/65W CF on my heavily planted 120-gallon tank (48 x 24 x 24) with an additional 2 x 250w MH (double ended) lights.


Wow, that would be impressive to see, a 120 G tank w/ either 720 or 780 Watts!
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Last edited by Tdon1md; 08-22-2011 at 12:06 PM..
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Old 10-10-2007, 02:26 PM   #5
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It seems that I am having a hard time getting light to the bottom of the tank (through all the other plants). I was thinking of going with the 150's, but I would hate to invest in the 150's and then find out that I want/need the 250's. I would probably keep only 2 of the 65w PC on only for color, becasue I agree that the MH would prob be too blue. Humm.....
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Old 10-10-2007, 03:52 PM   #6
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Wanted to know if you would have enough light? Here is an example of 3 150watts & 30" high too, so 2 would be more than enough light for your tank
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Old 10-11-2007, 12:57 AM   #7
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Thanks for the link, it really puts it into perspective. Thanks for all the feedback.
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Old 10-11-2007, 12:58 AM   #8
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I figured it would....
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Old 10-11-2007, 01:30 PM   #9
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I would go for it if you have enough of everything else to back up the lighting!
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Old 10-11-2007, 03:54 PM   #10
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Safe those troubles related to too much light. I have two 260g tank both with 3 x 150W MH. I found them already quite strong and it does penetrate real good to the bottom of the tank that some sensitive plant will die due to too much light, plants near or above the surface directly below the light might melt/dry up. That is why I raised the lamp a bit higher, and you may find that you need to keep it at least 12" from water surface.
In fact I keep my almost ridiculous 400W MH lamp at almost 3 feet away from water surface so that it works as it should, not blistering my plants.

I would opt for mild 70W, 150W at most, double ended MH and combine it with the existing PCs. 2 of them I think will be enough to cover the tank area.
Blast the MH for a shorter period (30-40%) if you need it and let the PC handle the rest. Look for those with 6500-10,000K range rating. Above that is usually very blue and not really much usable in spectrum. Below that you might find it too yellow even though they work great.
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Old 10-11-2007, 05:54 PM   #11
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What kind of PC light do you have? For a 24" tank you need good reflectors. I would consider going with a tek light either 4x54 or 6x54. My friend has a 4x54 tek on the same size tank and is getting very good results.
Here is the picture borrowed from Bill
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Old 10-11-2007, 07:08 PM   #12
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Quote:
Originally Posted by bwagner View Post
It seems that I am having a hard time getting light to the bottom of the tank (through all the other plants). I was thinking of going with the 150's, but I would hate to invest in the 150's and then find out that I want/need the 250's. I would probably keep only 2 of the 65w PC on only for color, becasue I agree that the MH would prob be too blue. Humm.....
2X150w MH will be fine. I have a 90g (48 x 18 x 24) with 2x150w MH and it is plenty bright to reach the bottom with it being 24" deep. I'm actually thinking of raising my lamp since it's so bright.

As Medicineman stated, you can go with either 6500 or 10k bulbs. Current sells 6500 MH bulbs that work well in my Coralife fixture.
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Old 11-11-2007, 12:45 PM   #13
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Thanks again for the advice, my new light is on the way. I ended up going with a 48" Coralife with 2-150W HQI MH and 2-96W PC. I also ordered 2 new 6500K HQI bulbs to change out the 10K ones that come with the system. Any recommendations on what to have the PC's to be? I was thinking 1-6500K and 1-10K....
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Old 11-11-2007, 07:37 PM   #14
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Current also makes a "Dual Daylight" w/ 6700 and 10000 in the same bulb. Might be another option.
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