Time to change the bulb? - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 03-02-2013, 03:15 PM Thread Starter
Planted Tank Guru
 
ThatGuyWithTheFish's Avatar
 
Join Date: Apr 2012
Location: Boston
Posts: 2,448
Time to change the bulb?

It's been 8 months now that I've had my Catalina 30" T5HO, and I've found difficulty getting color out of many plants. I was wondering if this could be related to an aging, sub par bulb. Otherwise, I think I might get a new fixture if it's not strong enough.


"Boulders-Upon-Meadow"


My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"


RAOK Club #69
ThatGuyWithTheFish is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 03-03-2013, 12:26 AM Thread Starter
Planted Tank Guru
 
ThatGuyWithTheFish's Avatar
 
Join Date: Apr 2012
Location: Boston
Posts: 2,448
Anybody?


"Boulders-Upon-Meadow"


My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"


RAOK Club #69
ThatGuyWithTheFish is offline  
post #3 of 13 (permalink) Old 03-03-2013, 12:35 AM
h4n
Planted Tank Guru
 
Join Date: Jan 2006
Location: Charlton, Mass
Posts: 4,901
i've heard of old bulbs doing that. But i think ive read most t5ho bulbs should be good for 1 year plus?

I also thought this with my catalina fixture... but i have yet to change bulbs either.

Its hards to say w/o knowing the par from the start to now.

A way to check and get a plants that is red under high light and float it at the surface. If it stays red at the surface and not down at the susbtrate then its not enough light.
h4n is offline  
post #4 of 13 (permalink) Old 03-03-2013, 12:52 AM Thread Starter
Planted Tank Guru
 
ThatGuyWithTheFish's Avatar
 
Join Date: Apr 2012
Location: Boston
Posts: 2,448
Quote:
Originally Posted by h4n View Post
i've heard of old bulbs doing that. But i think ive read most t5ho bulbs should be good for 1 year plus?

I also thought this with my catalina fixture... but i have yet to change bulbs either.

Its hards to say w/o knowing the par from the start to now.

A way to check and get a plants that is red under high light and float it at the surface. If it stays red at the surface and not down at the susbtrate then its not enough light.
Do you have one on a 20 Long? Then maybe we can compare. Yes, I have noticed that some of the plants you sent me first grew bright green, then grew more colorful as it reached the surface. And I've asked to borrow a meter here but no one will lend me one.


"Boulders-Upon-Meadow"


My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"


RAOK Club #69
ThatGuyWithTheFish is offline  
post #5 of 13 (permalink) Old 03-03-2013, 01:01 AM
h4n
Planted Tank Guru
 
Join Date: Jan 2006
Location: Charlton, Mass
Posts: 4,901
Re: Time to change the bulb?

I got a 36" 4x t5ho on my 30L

Is your a 4 bulb also?

-Sent from my Samsung Note, a "Phablet"
h4n is offline  
post #6 of 13 (permalink) Old 03-03-2013, 01:38 AM Thread Starter
Planted Tank Guru
 
ThatGuyWithTheFish's Avatar
 
Join Date: Apr 2012
Location: Boston
Posts: 2,448
Quote:
Originally Posted by h4n View Post
I got a 36" 4x t5ho on my 30L

Is your a 4 bulb also?

-Sent from my Samsung Note, a "Phablet"
Nope, one bulb. I was told it would be enough... and it's sitting right on top of the tank.


"Boulders-Upon-Meadow"


My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"


RAOK Club #69
ThatGuyWithTheFish is offline  
post #7 of 13 (permalink) Old 03-03-2013, 03:15 AM
h4n
Planted Tank Guru
 
Join Date: Jan 2006
Location: Charlton, Mass
Posts: 4,901
Re: Time to change the bulb?

Quote:
Originally Posted by ThatGuyWithTheFish View Post
Nope, one bulb. I was told it would be enough... and it's sitting right on top of the tank.
Hrmmm I'm not a light expert but sound like you need more light.


No algae either right?

-Sent from my Samsung Note, a "Phablet"
h4n is offline  
post #8 of 13 (permalink) Old 03-03-2013, 03:42 AM Thread Starter
Planted Tank Guru
 
ThatGuyWithTheFish's Avatar
 
Join Date: Apr 2012
Location: Boston
Posts: 2,448
Quote:
Originally Posted by h4n View Post
Hrmmm I'm not a light expert but sound like you need more light.


No algae either right?

-Sent from my Samsung Note, a "Phablet"
Nope, tons of BBA.


"Boulders-Upon-Meadow"


My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"


RAOK Club #69
ThatGuyWithTheFish is offline  
post #9 of 13 (permalink) Old 03-03-2013, 06:01 PM Thread Starter
Planted Tank Guru
 
ThatGuyWithTheFish's Avatar
 
Join Date: Apr 2012
Location: Boston
Posts: 2,448
Anybody else?


"Boulders-Upon-Meadow"


My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"


RAOK Club #69
ThatGuyWithTheFish is offline  
post #10 of 13 (permalink) Old 03-04-2013, 02:03 AM Thread Starter
Planted Tank Guru
 
ThatGuyWithTheFish's Avatar
 
Join Date: Apr 2012
Location: Boston
Posts: 2,448
...Or put it this way: what other fixture could I use that is slight higher light, grows colorful plants well, and preferably one that I don't have to hang high?


"Boulders-Upon-Meadow"


My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"


RAOK Club #69
ThatGuyWithTheFish is offline  
post #11 of 13 (permalink) Old 03-04-2013, 08:58 PM
Planted Tank Enthusiast
 
milesm's Avatar
 
Join Date: Apr 2006
Location: HI
Posts: 547
a 20l is 30 inches long. your bulb is probably 24 watts and 22" long. you are not getting enough par in the far corners of the tank, especially since the fixture is resting on the top of the tank. you could get a 2 bulb fixture and raise it about 4 to 6" (catalina sells the legs, right?) and that should give you better spread and par. ideally, you'd like to stagger the bulbs like this:

___________________xxxxxxxxx
xxxxxxxxx___________________

20l's are shallow, like 9-10" after adding substrate, so you really don't need too much light. your bba is likely due to inconsistent co2.

as to your OP, i've been using my t5ho bulbs for at least 2 years on my 20h. blyxa japonica, limnophila aromatica, and green rotala still grow like weeds.

Last edited by milesm; 03-04-2013 at 09:01 PM. Reason: to add x's
milesm is offline  
post #12 of 13 (permalink) Old 03-04-2013, 09:27 PM Thread Starter
Planted Tank Guru
 
ThatGuyWithTheFish's Avatar
 
Join Date: Apr 2012
Location: Boston
Posts: 2,448
I am not having any trouble growing plants though. And the color of the blyxa did not change when I lowered it.


"Boulders-Upon-Meadow"


My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"


RAOK Club #69
ThatGuyWithTheFish is offline  
post #13 of 13 (permalink) Old 03-04-2013, 11:58 PM
Planted Tank Enthusiast
 
gSTiTcH's Avatar
 
Join Date: Feb 2013
Location: Jacksonville, Florida
Posts: 838
Speaking strictly from my neophyte experience...

Green algae seems to favor high light, low/off balanced nutrients. BBA lights sub par lighting, with high nutrients (nitrate, specifically). Higher lighting = less nitrate, but also less CO2. Low CO2 + high light = green algae. It's a balancing act (difficult to maintain with DIY CO2 and a small tank).

From a lighting perspective, bulbs change output with age. General rule of thumb is ~1 year for a plant bulb, but there are factors that would shorten that life. Higher than normal voltage at the wall, voltage surges/sags, room temperature, extended photo period. If in doubt, pick up a new bulb and try it. If that doesn't correct things in a few weeks, then you can put the old bulb back in and you'll have a spare.
gSTiTcH is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome