Color Temperature - Page 3 - Lighting - Aquatic Plant Central

Go Back   Aquatic Plant Central > Special Interest Forums > Lighting

Lighting Science of Aquatic Lighting - Aquarium lighting is essential for healthy aquatic plants. Discuss proper aquatic lighting for your plants and fish here.

Reply
 
LinkBack Thread Tools Display Modes
Old 09-07-2006, 01:48 PM   #21 (permalink)
Junior Member
 
Join Date: Sep 2006
Posts: 24
iTrader Ratings: 0
caymandiver75 is a regular member
Default

Quote:
Originally Posted by DJKronik57
So has anyone tried an 8000K bulb? I know ADA makes them but I don't have that much cash laying around (i.e. I'd have to buy a totally new fixture because of the pin arrangement. Stupid competing standards), but I found out that All Glass makes an 8000K 55/65W bulb that fits into my Coralife fixture. I've heard 8000K is "optimal" and if ADA uses it there has to be some benefit, even if it is just in viewing the tank.

Here's a link to the Coralife bulb and light output graph (looks like it lines up with the earlier mentioned wavelengths needed for plants):

All-Glass Aquarium - Aquarium Lighting

Oh and, anyone know what 55/65W means? How is it both?
I currently have the 8000k CF bulbs in my All-Glass lighting. It looks good, but i'm not impressed with how washed out it makes the reds in fish. I just ordered some GE 9325 bulbs today, so hopefully I'll be happy with them.

caymandiver75 is offline   Reply With Quote

Advertisement [Remove Advertisement]
Old 09-07-2006, 07:30 PM   #22 (permalink)
Senior Member
 
gnatster's Avatar
 
Join Date: Mar 2004
Location: Plano, TX
Posts: 2,491
iTrader Ratings: 10
iTrader Positive Rating: 100%
gnatster is a regular member
Default

One way to look at the Kelvin figure is that it is a "sum" of the various wavelengths the bulb produces. Just as there are many ways to reach a total "sum" when adding a multitude of numbers the same Kelvin rating for various bulbs can have different spectral peaks.

With this in mind just because bulb A is 10,000K does not mean it will have the same spectrum as bulb B, also rated at 10,000K. Nor will both bulbs give the tank the same look.
gnatster is offline   Reply With Quote
Old 09-07-2006, 09:25 PM   #23 (permalink)
Senior Member
 
DJKronik57's Avatar
 
Join Date: Apr 2006
Location: Boston, MA
Posts: 441
iTrader Ratings: 19
iTrader Positive Rating: 100%
DJKronik57 is a regular member
Default

Thanks for your picture and feedback caymandiver! I agree that any one color temerature will have its benefits and drawbacks, and that mixing color temperatures is probably the best way to go in terms of looks and plant productivity.

The 8000K All-Glass does look pretty nice though, not too blue. Has anyone mixed this with a Coralife 6700K bulb? Trying to decide what the best combination would be. 9325K and 8000K seem like it would wash out the greens of the plants, since both tend to have large red and blue outputs and very little green. The GE 9325K bulbs I have did bring out the reds in the fish like no other bulb though. Post some pictures when you get the 9325K bulbs, I'd love to see them mixed if you have a dual bulb fixture!

Gnatster: Point taken, I was refering to the spectral output though, not the color temperature, i.e. the spectral output of the All Glass matches up with the most useful outputs for photosynthesis (and I'm assuming the ADA bulb comes pretty close as well, Amano wouldn't have it any other way).
DJKronik57 is offline   Reply With Quote
 
Old 09-08-2006, 12:51 AM   #24 (permalink)
 
Join Date: Jul 2006
Posts: 65
iTrader Ratings: 0
mousky is a regular member
Thumbs up

I vote this thread as a sticky.

All this time I have been going off colour temperature alone, now with the help of you guys I will look more closely at the graphs on the box - Thank you
mousky is offline   Reply With Quote
Old 09-08-2006, 10:47 PM   #25 (permalink)
 
Join Date: Aug 2006
Posts: 28
iTrader Ratings: 0
Rattail is a regular member
Default

Now this is one area I am really battling with.

Please tell me: is there a real difference between daylight Flourescent tubes one buys at the light shop and flourescent tubes one buys at an aquatic shop (LFS).

In South Africa, we pay a fortune for specialised aquarium tubes, so I'd be only too happy if "normal" daylight flourescent tubes will work as well.

I am told by the lady at the light shop that a normal Osram 3foot "daylight" fluorescent tube pushes out about 1500 at around 30 (something Watt. These will cost me R9.00 ($1.30) as opposed to between R110 and R180 for a Growlux at a LFS. (So you see my dilemma...)

(I am setting up a 1200mmx450mmx600mm (deep) aquarium) and intend using plants requiring moderate light).

Please help?
Rattail is offline   Reply With Quote
Old 09-09-2006, 05:26 AM   #26 (permalink)
Senior Member
 
standoyo's Avatar
 
Join Date: Aug 2005
Location: kuala lumpur, malaysia
Posts: 488
iTrader Ratings: 0
standoyo is a regular member
Default

Not sure about Osrams but I'm using Phillips 865's which does the job at a fraction of the cost. Plants are pearling, reds are red, greens are green and blues look brilliant. Nothing fake looking and best of all my camera white balance gets it right.
standoyo is offline   Reply With Quote
Old 09-09-2006, 11:07 PM   #27 (permalink)
Member
 
Join Date: Jun 2004
Location: Dubai, U.A.E
Posts: 64
iTrader Ratings: 0
Skyfish is a regular member
Default

Quote:
Originally Posted by standoyo
Not sure about Osrams but I'm using Phillips 865's which does the job at a fraction of the cost. Plants are pearling, reds are red, greens are green and blues look brilliant. Nothing fake looking and best of all my camera white balance gets it right.
Standoyo do you have the exact model number stated on the bulb? I would like to try this one.

Cheers!
Skyfish is offline   Reply With Quote
Old 09-10-2006, 06:03 AM   #28 (permalink)
Senior Member
 
gf225's Avatar
 
Join Date: Mar 2005
Location: UK
Posts: 646
iTrader Ratings: 0
gf225 is a regular member
Default

Great thread.

I've used T8 tubes from 3000K (Dennerle Trocal) upto a claimed 18000K (Hagen Aqua Glo). I had best results in terms of growth and attractiveness from 6500K that has 4 spectral peaks (Interpet Daylight Plus). They also had the greatest lumen rating (1300 for 24" 18w) compared to the Sylvania Activa 172 (6500K, CRI 98, 1000 lumen).

As discussed colour temp. and spectrums are independent. Using the Interpet and Sylvania 6500Ks as an example, the Sylvania appeared greener so suspect less effective for plant growth than the Interpet.

One thing I will say is that colour temps, spectrums etc. are less important the more physical qty. of light we have. Plants, IME can adapt to very different spectrums quite well so I now choose what suits my taste (rendition wise) and budget.

Being from the UK I don't have access the the popular GE 9235K and 10000K bulbs. Are these PC T5?

I'd like to try out the ADA 8000K T8s but they're 20mm shorter than the standard 18/20w T8 tubes so won't fit my unit.
gf225 is offline   Reply With Quote
Old 09-12-2006, 02:17 PM   #29 (permalink)
Senior Member
 
Join Date: Jul 2006
Location: Twin Cities Metro, North East
Posts: 452
iTrader Ratings: 0
ruki is a regular member
Default

Quote:
Originally Posted by gnatster
One way to look at the Kelvin figure is that it is a "sum" of the various wavelengths the bulb produces. Just as there are many ways to reach a total "sum" when adding a multitude of numbers the same Kelvin rating for various bulbs can have different spectral peaks.
From a statistical perspective it is an average, which is the sum you mentioned divided by the number of data points (or emission spikes).

Quote:
With this in mind just because bulb A is 10,000K does not mean it will have the same spectrum as bulb B, also rated at 10,000K. Nor will both bulbs give the tank the same look.
Yes. This is one of the main weaknesses of the degree K rating of the bulb. Bulb makers should really include a spectrum chart on all bulbs that they give degree K ratings for.
ruki is offline   Reply With Quote
Old 09-12-2006, 02:35 PM   #30 (permalink)
Senior Member
 
Join Date: Jul 2006
Location: Twin Cities Metro, North East
Posts: 452
iTrader Ratings: 0
ruki is a regular member
Default

Quote:
Originally Posted by Rattail
Now this is one area I am really battling with.

Please tell me: is there a real difference between daylight Flourescent tubes one buys at the light shop and flourescent tubes one buys at an aquatic shop (LFS).
The detailed answer is that all bulbs are different.

The not-so-detailed answer is that 5000K ("daylight") and 6500K ("full spectrum") bulbs at lighting stores will do a good enough job, especially when considering the high cost of high end speciality aquatic plant bulbs.

For advanced uses such as photography and show tanks, some of the specifically mentioned bulbs on this thread do a better job, but are usually more expensive than the "generic" 500K and 6500K bulbs.

Last edited by ruki; 09-12-2006 at 03:09 PM..
ruki is offline   Reply With Quote
Reply


Aquatic Plant Central > Special Interest Forums > Lighting > Color Temperature

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Aquatic Plant Forum Replies Last Post
What's your tank's temperature? banderbe APC Polls 28 09-17-2012 01:10 PM
Horwort and temperature Lord Nibbler New to Planted Aquariums 4 08-08-2006 12:12 PM
Temperature Controllers Raul-7 Equipment 4 02-21-2006 09:29 PM
Water Temperature urville General Aquarium Plants Discussions 4 09-18-2005 05:14 PM
[color=green]is there a aquarium gallery here?[/color] thinkgreen General Aquarium Plants Discussions 1 04-05-2004 12:13 AM


All times are GMT -8. The time now is 07:41 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

Search Engine Friendly URLs by vBSEO 3.6.1