View Full Version : Lighting?

07-21-2010, 06:08 PM
For my 46g tank, I plan to do this setup for the lighting:

Two Coralife F/W T-5 Aqualight Double Strip Lights,
and this for the bulb setup:
2x 6,700k 21w
2x 18,000k 39w

Which would give me a total of 120w for the tank, Do you guys think this is a good setup?

07-21-2010, 06:50 PM
Depending on your light placement, you're almost at "high level" lighting.
I would think you could try to grow just about anything in there, especially if they are T5HO fixtures/bulbs. Not sure what look the 18000K bulbs will give you, but you could always change them out for 10000K if they are too bright.

07-21-2010, 06:52 PM
Are you planning on doing a planted tank? Why are you opting for the 18K bulbs (scratches head) ?

07-21-2010, 06:58 PM
18,000K does nothing benefitial for a planted tank. Plants grow their best under 5000-8000K spectrum. Most people use something in the 6500K range as it is appealing to the eye and the plants get the maximum benefit from its spectrum. Of course you can go on up to a 10,000K bulb as it does look much better without your plants caring to much about it.

07-21-2010, 07:01 PM
Iím still learning about lighting, but I have learned the hard way that you have to be careful with 18,000K lighting. Using it can be like introducing algae steroids into your tank. I tried 18,000K lighting once in a light to moderately planted tank and in about 3 weeks everything but my fish were covered in algae. Even my substrate.

Iím not saying that is going to happen to you, just stating the importance of really doing your homework before using 18,000K lighting

07-21-2010, 07:08 PM
That is generally the result people have when using actinic on FW planted tanks. The spectrum of lighting should best be left to marine tanks or for random periodic use in non planted tanks :22:

07-21-2010, 09:31 PM
I'll pull back on the 18k lights then, this tank is going to be heavly planted, but I don't know much about lighting, hence why I posted here. This is what I think I'll do for the lighting:
2x 21w 6.7k and 2 x 39w 6.7k

So I still get a good amount light, and the plants will soak it all up.

07-21-2010, 09:54 PM
Sounds just about perfect. I would buy a timer and run primarily the 2*39watt fixture for around 7-8hrs a day and then kick on the 2*21watt fixture for a mid-day burst for about 2hrs. T5s are extremely efficient lighting standard WPG rules dont really apply to them, you honestly wouldnt need the 2*21watt fixture at all but if you already have it no point not getting some benefit out of it.

07-21-2010, 10:16 PM
I didn't know that all, I haven't bought the lights yet. If I can go with one fixture and use the two 39w fixture instead I will. The fixture i'm buying comes with one 21w 6.7k bulb, and I would be buying the two 39w bulbs for the fixture.

07-21-2010, 11:27 PM
Your going to put 39watt HOT5 bulbs into a T5 21watt fixture? If so that wont work as the balast in those standard output T5 fixtures wont fully drive the 39watt bulbs. If you are going for a full HO fixture the 2*39watt would be perfectly adequate. If you are going for a standard output I would go for 2 of the 2*21watt fixtures...which would just about equal the performance of the HO 2*39watt.

07-21-2010, 11:54 PM
This is the fixture I was going to go with:
And these are bulbs I was going to replace them with:

So, I would have to get a t-5 HO fixture instead of that one?
Like this?:

07-22-2010, 02:26 AM
Yeah you cant run HO bulbs in a SO fixture, you would have to get that fixture on Fosterandsmithaquatics.com to run the 39watt bulbs. The bulbs that come with that Current Freshwater fixture are great for plant growth, you wouldnt need to change them and HOT5 bulbs generally are in perfect working order up to 1year. :22: