Go Back   Aquarium Advice - Aquarium Forum Community > Saltwater and Reef > Saltwater Reef Aquaria
Click Here to Login

Join Aquarium Advice Today
Reply
 
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
 
Old 02-24-2004, 12:23 AM   #1
Aquarium Advice FINatic
 
Join Date: Nov 2003
Location: Springfield, MO
Posts: 861
Send a message via MSN to Brisc0
Difference in 420nm and 460nm 03's?

I just found a brand of PC bulbs with square pins "Current USA" They offer a 420nm and a 460nm bulb and I have no idea what the difference is. Any help?
__________________

__________________
Here's to swimmin with bowlegged women.

-105G SPS Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.
Brisc0 is offline   Reply With Quote
Old 02-24-2004, 12:30 AM   #2
Aquarium Advice Freak
 
Join Date: Jan 2004
Location: Bedford Hills, NY
Posts: 251
That is the peak wavelength output of the light bulb measured in nanometers.

You are probably more familiar with the color temperature. This can be arrived at by dividing the constant 2,900,000 by the wavelength in NanoMeters. For example:

2,900,000/420nm = 6905 K

2,900,000/460nm = 6305 K

So bulbs with these spectral peaks are good aquarium bulbs but not as Bluish or whitish as bulbs at 10,000 k bulbs.

HTH

Tom
__________________

__________________
"Not everything that can be counted counts, and not everything that counts can be counted."
- Albert Einstein (1879-1955)
TheMadNucleus is offline   Reply With Quote
Old 02-24-2004, 12:31 AM   #3
AA Team Emeritus
 
reefrunner69's Avatar
 
Join Date: May 2002
Location: Cedar Key, FL
Posts: 1,663
At 420nm the light should be a light blue, the 460nm should be a deeper puple as it's going more towars violet. Both should make your corals floresce. The 420 should be a bit brighter.
__________________
Kevin

Visit Nature Coast Photography
reefrunner69 is offline   Reply With Quote
Old 02-24-2004, 12:39 AM   #4
Aquarium Advice FINatic
 
Join Date: Nov 2003
Location: Springfield, MO
Posts: 861
Send a message via MSN to Brisc0
When you say brighter is that in regards to the florescence or the lighting in general. I have four 10K daylight bulbs already I am interested in what makes the corals look the best. Thanks for the awesome info and speedy replies its greatly appreciated!
__________________
Here's to swimmin with bowlegged women.

-105G SPS Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.
Brisc0 is offline   Reply With Quote
Old 02-24-2004, 12:51 AM   #5
AA Team Emeritus
 
reefrunner69's Avatar
 
Join Date: May 2002
Location: Cedar Key, FL
Posts: 1,663
Quote:
When you say brighter is that in regards to the florescence or the lighting in general.
I mean in general, although it is my experience the ligher "blue" does flouresce the corals better. The more purple bulb will have more of it's out put in the UV which is invisible, so the other will seem more intense.
__________________
Kevin

Visit Nature Coast Photography
reefrunner69 is offline   Reply With Quote
Old 02-24-2004, 09:50 AM   #6
AA Team Emeritus
 
Join Date: May 2002
Location: Virginia
Posts: 2,256
Send a message via ICQ to fishfreek Send a message via AIM to fishfreek Send a message via MSN to fishfreek Send a message via Yahoo to fishfreek
Brighter = more light in the visual specitrum
__________________
Remember dont tap the glass, your fish will think you're an idiot -Anonymous mother

Check out our articles area. 30+ Aquatic articles for your enjoyment
Are you in or around the Shenandoah Valley area? If so click here to join our regional forum.
fishfreek is offline   Reply With Quote
Old 02-24-2004, 10:40 AM   #7
Aquarium Advice FINatic
 
Join Date: May 2002
Location: Western NY
Posts: 610
Send a message via ICQ to Bang Guy
Quote:
Originally Posted by TheMadNucleus
You are probably more familiar with the color temperature. This can be arrived at by dividing the constant 2,900,000 by the wavelength in NanoMeters. For example:

2,900,000/420nm = 6905 K
sorry... this equation just doesn't work.

fyi - Actinic light (420nm) has no Kelvin temp. The scale only goes to 20,000K and 420nm is far far beyond that.

If I had to choose between 460nm and 420nm it would be 420nm hands down.

To me the 460nm sounds more like a bulb with blue glass that filters out everything except the blue light where the 420nm sounds to me like a bulb using phosphors that peak at 420nm. Just guessing though since I don't know what bulbs you're referring to.
__________________
If you wake up breathing CONGRATULATIONS!!! You get another chance to do it right.
Bang Guy is offline   Reply With Quote
Old 02-24-2004, 12:04 PM   #8
Aquarium Advice Freak
 
Join Date: Jan 2004
Location: Bedford Hills, NY
Posts: 251
Sorry this equation does work - the reason that Actinic is not measured in Kelvins is that part of the spectrum is filtered by using Actinic reacting gases in the flourescent tube and therefore the spectrum is limited to a narrow bandwidth i.e. does not exactly follow the "black-object-heated" rule of spectrum vs. temperature.

However, the rating 420nm exactly means that that is the PEAK WAVELENGTH of the light emitted by the bulb (however at a narrow bandwidth). So the temperature of the light is meaningful but those unfamiliar with its meaning and application think that it does not apply.

"goes up to 20,000k" You mention that 420nm is far beyond that - what does that mean??? are you talking about visible spectrum or radiation in general. The statement about it being far beyond that is totally meaningless. The visible spectrum is about 320nm to 720nm (about 10,000k to 4,000k).


Also be aware that it works the other way, for example:

2900000/10,000k = 290nm Peak wave length for a 10,000k Bulb.

household bulbs of approx. 5000K:

2,900,000/ 5000k = 580nm

This is a very well known equation for converting temperature to wavelength and visa versa - you will find it in any physics 101 class. It does apply to actinic bulbs as well as long as you understand the meaning of temperature and light and that Actinic has a peak output but has a narrow bandwidth as well.

But thanks for your interest.

HTH




Tom
__________________
"Not everything that can be counted counts, and not everything that counts can be counted."
- Albert Einstein (1879-1955)
TheMadNucleus is offline   Reply With Quote
Old 02-24-2004, 02:05 PM   #9
Aquarium Advice FINatic
 
Join Date: Nov 2003
Location: Springfield, MO
Posts: 861
Send a message via MSN to Brisc0
Okay just to clarify a little bit I just spoke to the guys over at MarineandReef.com to place my bulb order. For those of you familiar with CSL bulbs, the 460nm is what they sold as their "Ultra Actinic" its the bulb that I have been trying to get away from for so long as it has IMHO 0 asthetic value. The 420nm bulb is the identical light spectrum of Coralifes true 03 actinic which I consider to be a superior bulb, however it is not available in square pin. This new brand "current USA" offers both of these bulbs in square pin as well as a "Dual Actinic" which is 50/50 420nm and 460nm. So for those of you out there who need replacement bulbs for your CSL fixtures, current USA now offers them in 22" 65W and all the other standard lengths and wattages.
HTH (even though its my question LoL)
__________________
Here's to swimmin with bowlegged women.

-105G SPS Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.
Brisc0 is offline   Reply With Quote
Old 02-24-2004, 02:43 PM   #10
Aquarium Advice Freak
 
Join Date: Jan 2004
Location: Bedford Hills, NY
Posts: 251
funny - guess you answered your own question

Hey Brisco - thanks for the info - good stuff.
__________________

__________________
"Not everything that can be counted counts, and not everything that counts can be counted."
- Albert Einstein (1879-1955)
TheMadNucleus is offline   Reply With Quote
Reply

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2X24" 24W T5HO 460nm Actinic Bulbs fort384 Archive 1 02-23-2009 12:26 AM
what is the difference between.. krap101 Freshwater & Brackish - Getting Started 7 06-02-2005 10:40 PM
What's the difference? Batman77 Saltwater Fish Only & FOWLR 2 07-27-2004 06:54 PM
what is the difference Chapin874 Saltwater Reef Aquaria 4 03-05-2004 10:46 PM
Current USA 420nm came today Brisc0 Saltwater Reef Aquaria 2 03-01-2004 10:18 PM







» Photo Contest Winners








Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 01:25 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.