PC's - Intial intensity
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > Specific Aspects of a Planted Tank > Lighting


Reply
 
Thread Tools Display Modes
Old 07-18-2003, 09:22 PM   #1
Doomer
Planted Tank Obsessed
 
PTrader: (0/0%)
Join Date: Jan 2003
Location: The Boondocks
Posts: 468
Default

When PC's are new they are a good deal brighter than they'll be for the majority of their life. Anybody know how much intensity they loose in the first month or so ? Or maybe a graph that shows intensity vs. life ?

Thanks
Doomer is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 07-18-2003, 09:49 PM   #2
GDominy
Planted Tank VIP
 
GDominy's Avatar
 
PTrader: (0/0%)
Join Date: Jul 2002
Location: Victoria,British Columbia, Canada
Posts: 3,363
Default

That all depends on the bulb. Most manufacturers will list the initial Lumens with the Average Lumens as seperate statistics for the bulb.

What kin dof bulbs are you trying to get the specs for?
GDominy is offline   Reply With Quote Quick reply to this message
Old 07-18-2003, 09:56 PM   #3
GDominy
Planted Tank VIP
 
GDominy's Avatar
 
PTrader: (0/0%)
Join Date: Jul 2002
Location: Victoria,British Columbia, Canada
Posts: 3,363
Default

Just an example, the GE 55 Watt PC bulbs that we have been discussing recently have an initial Lumen count of 4800. After a month this should drop to about 4080 Lumens, an approximate drop of 15% of the initial brightness
GDominy is offline   Reply With Quote Quick reply to this message
Old 07-18-2003, 10:38 PM   #4
Doomer
Planted Tank Obsessed
 
PTrader: (0/0%)
Join Date: Jan 2003
Location: The Boondocks
Posts: 468
Default

Mine came from AH Supply. Dunno the brand, it's not listed on the box and all I can see on the bulb itself is 55w 6700k.

Everyone seems to talk in terms of watts per gallon rather than lumens which I've always thought was kinda strange. A 55watt bulb will remain a 55watt bulb it's entire life but if light output changes, as it obviously does, then thinking in terms of watts seems like a dumb way to approach lighting for a planted tank.

When one says that 3 WPG is ideal for a planted tank, is that new watts or old watts ?
Doomer is offline   Reply With Quote Quick reply to this message
Old 07-18-2003, 11:36 PM   #5
GDominy
Planted Tank VIP
 
GDominy's Avatar
 
PTrader: (0/0%)
Join Date: Jul 2002
Location: Victoria,British Columbia, Canada
Posts: 3,363
Default

A watt is merely a measure of power consumption, it is a poor indication of light usage for plants. Lumens are also a poor indicator of light usage for plants as it is simply an indication of the light visible to the human eye, it has nothing to do with the radiation that the plants utilize.

The Watt per gallon rule is a "ROUGH" indication only of how much light you are providing your plants. Its not an exact science, and it never will be.

I guess in short what I am trying to say is:

A watt is a watt is a watt

No matter how old it is, a watt of energy is still a watt of energy.
GDominy is offline   Reply With Quote Quick reply to this message
Old 07-19-2003, 12:30 AM   #6
Doomer
Planted Tank Obsessed
 
PTrader: (0/0%)
Join Date: Jan 2003
Location: The Boondocks
Posts: 468
Default

Yes but what do plants care of watts.

My original point was that a 55 watt lamp is always a 55 watt lamp. When new, it gives off more light. I assume that it does not consume more than 55 watts when new therefore a new watt is not an old watt.

I ask this question occassionally but have never gotten a straight answer.
Doomer is offline   Reply With Quote Quick reply to this message
Old 07-19-2003, 12:58 AM   #7
m.lemay
Planted Tank Guru
 
m.lemay's Avatar
 
PTrader: (9/100%)
Join Date: Jul 2002
Location: Naugatuck, CT.
Posts: 2,647
Default

Quote:
Yes but what do plants care of watts.
Plants don't care much about lumens either...... or color temp. What they really want is light thats high in the red and blue spectrums. None of the above measurements indicate one iota as to the red/blue output of a given lamp.

Marcel
__________________
FILSTAR Pimp #2

75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.
m.lemay is offline   Reply With Quote Quick reply to this message
Old 07-19-2003, 01:26 AM   #8
Doomer
Planted Tank Obsessed
 
PTrader: (0/0%)
Join Date: Jan 2003
Location: The Boondocks
Posts: 468
Default

Thanks m.lemay. Time to do a little research to see if I can dig up this info on the lamps I'm currently running.
Doomer is offline   Reply With Quote Quick reply to this message
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:

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
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Light Intensity NewKidontheBlock Lighting 3 07-02-2004 07:30 PM
Light intensity? shwin Lighting 4 04-23-2004 04:25 PM
photoperiod/light intensity newkidvoodoo Lighting 10 04-09-2004 06:01 PM
The Potential Importance of Tank Depth on Light Attenuation Splash Lighting 25 03-26-2004 08:41 PM


All times are GMT. The time now is 08:51 PM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012