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nwnittany
03-27-2010, 04:46 PM
Novice question here. I've looked around, but can't seem to find a good answer and thought I'd ask here.

I'm using two 36" T5HO light fixtures, each with two 39W bulbs, on my 125 planted freshwater community. The tank dimensions are standard (6ft long, 20" tall).

Each light fixture has 2 bulbs. One is a 6700 Hagen Life-Glo, and from what I can gather, this is a good bulb for a planted freshwater tank. The other bulb is an 18000 Hagen Power-Glo, which from what I can tell, is really intended for marine/sw or tall tanks, although in Hagen's description of what tanks the bulb would be 'ideal' for, included planted freshwater tanks.

What are the implications of using two of these 18000 bulbs paired with two of the 6700' ? Is it as simple as they won't provide lighting as effectively as four 6700's would ? Or are there other side effects ?

Will the tank balance be upset when I rotate the bulbs out and go to all 6700's in a year or so ?

If you are wondering, I got a great deal on the 18000 (a closeout sale).

Cliff
03-27-2010, 10:48 PM
Novice question here. I've looked around, but can't seem to find a good answer and thought I'd ask here.

I'm using two 36" T5HO light fixtures, each with two 39W bulbs, on my 125 planted freshwater community. The tank dimensions are standard (6ft long, 20" tall).

Each light fixture has 2 bulbs. One is a 6700 Hagen Life-Glo, and from what I can gather, this is a good bulb for a planted freshwater tank. The other bulb is an 18000 Hagen Power-Glo, which from what I can tell, is really intended for marine/sw or tall tanks, although in Hagen's description of what tanks the bulb would be 'ideal' for, included planted freshwater tanks.

What are the implications of using two of these 18000 bulbs paired with two of the 6700' ? Is it as simple as they won't provide lighting as effectively as four 6700's would ? Or are there other side effects ?

Will the tank balance be upset when I rotate the bulbs out and go to all 6700's in a year or so ?

If you are wondering, I got a great deal on the 18000 (a closeout sale).

Sounds like we found the same great deal on the lighting

I think the the answere to your question would really depend on the requirements of your plants. 180000K is a very bright light with a lot of light in the blue spectrum (as I resently found out from another member)

I had a dual T5 fixture with two 39 watt blubs at 18000K of light on my 36 gallon. I ended up get a lot of algae as it really likes the 18000k of light. I ended up replacing the blubs with lower intensity as I only have low light plants in there.

Long winded anwere to say it depends on your plants and watch for aglue with those bright lights as they would typically be on a SW tank

gm72
03-27-2010, 11:44 PM
As already suggested the 18000K bulbs will do wonders for growing algae but not much else. Some folks have good success with 10000K bulbs and most people would tell you to run 6700K bulbs. I sometimes run a combination of bulbs to good effect.

nwnittany
03-28-2010, 12:11 AM
Hmmm.... starting to sound like I need some new bulbs...and swap out the 18000....

Sarkazmo
03-28-2010, 12:37 AM
18000k is for reef. I mean you could use 'em with your planted tank but the plants aren't going to get all the proper wavelengths of light to promote growth. 18000k is a very blue white light. 5700k - 6700k is considered by most the best Kelvin rating range to use for the planted aquarium.

Sark

nwnittany
03-28-2010, 01:08 AM
Serves me right for listening to the vendor !!!!

----------------------------------------------------

Power-Glo Super Bright Aquarium Lamp

High Output T5 Fluorescent Tube

18,000 Kelvin

Ideal For :

* Freshwater Aquariums
* Saltwater Aquariums
* Corals
* Invertebrates
* Planted Aquariums
---------------------------------------------
:hmm3grin2orange:

BTW, thanks to everyone for helping... I just ordered two more 6700's...

nwnittany
04-05-2010, 06:06 PM
As already suggested the 18000K bulbs will do wonders for growing algae but not much else.

Well, this turned out to be true...LOL....

I ended up ditching the 18000 for another pair of 6700....I'm still searching for the balance in this tank (it's only been a few months)....

Thanks again to all for the advice.