Lighting an Aquarium with PAR instead of Watts - Page 11
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 02-26-2013, 09:44 PM   #151
madness
Wannabe Guru
 
PTrader: (14/100%)
Join Date: Jul 2011
Location: Denver, CO
Posts: 1,698
Default

Quote:
Originally Posted by assasin6547 View Post
Quick question, would a Finnex LED 12" be "high" light for a 7.5 gallon 12x12x12 Mr aqua cube? Is that good enough to grow HC, DHG, Riccia and needle leaf ludwigia?

Thanks
If I read the charts correctly I think that you will be around 50mmol in a 12" cube tank if you use the Ray 2. Maybe down to 40 or so depending upon the details of the 12" version of the fixture.

That borders on high light. Depending upon who you ask it should grow just about everything. Might be pushing the edge of where you need to run CO2 though.
madness is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-26-2013, 09:49 PM   #152
hcdcharts
Algae Grower
 
PTrader: (0/0%)
Join Date: Feb 2008
Location: Maryland
Posts: 5
Default AH Supply T5HO

Hello All,

What a great thread. I have a question concerning the AH Supply T5HO Bright Lights they sell with their reflectors. On Hoppy's chart he refers to their PC fixtures and reflectors and PAR readings but no mention of their T5HO lights. I'm sure Hoppy has better things to do than test every fixture on the market....so I have 2 48" T5HO of those lights w/reflectors over a 90 gallon about 24" above the substrate and about 8" apart. I am looking for the high end of medium light. I use CO2, I just do not want to go crazy with it as I use Excel. Is this enough light or not? Are these lights on par with Catalina's line?

Last edited by hcdcharts; 02-26-2013 at 10:22 PM.. Reason: user clarification
hcdcharts is offline   Reply With Quote
Old 02-26-2013, 11:22 PM   #153
Hoppy
Planted Tank Guru
 
Hoppy's Avatar
 
PTrader: (74/100%)
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 18,790
Default

Quote:
Originally Posted by hcdcharts View Post
Hello All,

What a great thread. I have a question concerning the AH Supply T5HO Bright Lights they sell with their reflectors. On Hoppy's chart he refers to their PC fixtures and reflectors and PAR readings but no mention of their T5HO lights. I'm sure Hoppy has better things to do than test every fixture on the market....so I have 2 48" T5HO of those lights w/reflectors over a 90 gallon about 24" above the substrate and about 8" apart. I am looking for the high end of medium light. I use CO2, I just do not want to go crazy with it as I use Excel. Is this enough light or not? Are these lights on par with Catalina's line?
Someone with access to a PAR meter needs to do some testing to be sure how good those AH Supply T5HO lights are. Based on their reflector design I suspect they are comparable to the Tek or ATI lights, as far as PAR is concerned. So, I suspect each bulb would give you around 25 micromols of PAR at that distance. With the bulbs spaced 8 inches apart you would possibly get almost twice as much PAR with 2 bulbs, possibly a little less. Maybe 40-50 micromols of PAR or medium light.
__________________
Hoppy
Hoppy is offline   Reply With Quote
Old 02-26-2013, 11:34 PM   #154
hcdcharts
Algae Grower
 
PTrader: (0/0%)
Join Date: Feb 2008
Location: Maryland
Posts: 5
Default

Thanks Hoppy, that helps a great deal!!
hcdcharts is offline   Reply With Quote
Old 02-26-2013, 11:35 PM   #155
Jeffww
Planted Tank Guru
 
PTrader: (9/100%)
Join Date: Aug 2010
Location: Houston
Posts: 2,258
Default

I have a rather long 5g tank with two cfls suspended 15"above the substrate. The lighting is 2x26w in two 8.5" dome reflectors. The bulbs stick out maybe 3/4". Is this too much light? I'm kind of confused because the PAR graph says much over 100PAR which seems like a crazy amount if 50 is already "high light". Even reducing to 13w bulbs doesn't seem to be much different. In fact, I think they might be MORE light since they would be completely contained within the dome. I do have pressurized co2 though...However this is more PAR than what was on my 60p with 2x24w T5HO!

What's your opinion?

Last edited by Jeffww; 02-26-2013 at 11:48 PM.. Reason: ....
Jeffww is offline   Reply With Quote
Old 02-27-2013, 01:44 AM   #156
Hoppy
Planted Tank Guru
 
Hoppy's Avatar
 
PTrader: (74/100%)
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 18,790
Default

We had difficulties when trying to get repeatable PAR readings with those 8.5 inch diameter reflectors with CFL bulbs. There are just too many variables, including the actual physical size of the bulbs, which varies with manufacturer. I keep thinking I will go back and work on this again, but I haven't done so. I can't figure out a way to get data that will work for a variety of reflectors, bulbs, manufacturers, etc. I hope someone else will work on this.
__________________
Hoppy
Hoppy is offline   Reply With Quote
Old 02-27-2013, 02:09 AM   #157
Jeffww
Planted Tank Guru
 
PTrader: (9/100%)
Join Date: Aug 2010
Location: Houston
Posts: 2,258
Default

Do you think that there's a high likelihood that I have too much light? I'm getting stunting in my R. rotundifolia of all things.
Jeffww is offline   Reply With Quote
Old 02-28-2013, 04:48 PM   #158
Hoppy
Planted Tank Guru
 
Hoppy's Avatar
 
PTrader: (74/100%)
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 18,790
Default

Quote:
Originally Posted by Jeffww View Post
Do you think that there's a high likelihood that I have too much light? I'm getting stunting in my R. rotundifolia of all things.
Intuitively only, I think you probably have high light, but I don't see that stunting any plants. Any stunting would be from a shortage of a nutrient, probably CO2. With high light you do need a lot of dissolved CO2 in the water to enable the plants to grow as fast as the light is driving them to grow.
__________________
Hoppy
Hoppy is offline   Reply With Quote
Old 02-28-2013, 07:33 PM   #159
herns
Planted Tank Guru
 
herns's Avatar
 
PTrader: (232/100%)
Join Date: May 2008
Location: Los Angeles
Posts: 2,940
Default

Quote:
Any stunting would be from a shortage of a nutrient, probably CO2. With high light you do need a lot of dissolved CO2 in the water to enable the plants to grow as fast as the light is driving them to grow.
Does cutting back lighting period somehow helps stunting growth? Assuming CO2 is up to optimum level but light is just high.

Good info. Thanks for putting this up.
herns is online now   Reply With Quote
Old 03-04-2013, 03:33 AM   #160
xmas_one
Planted Tank Guru
 
xmas_one's Avatar
 
PTrader: (17/100%)
Join Date: Feb 2010
Location: Long Beach, CA
Posts: 3,250
Default

Just pulled a read with the mrgreen meter, two 70w mh jbj vipers on a 90gal 24*24*36 = 50 par @ 24" deep.
xmas_one is offline   Reply With Quote
Old 03-06-2013, 10:06 PM   #161
newbieplanter
Planted Tank Enthusiast
 
PTrader: (26/100%)
Join Date: Jan 2013
Location: Boston ma
Posts: 704
Default

I still have no idea what any of this means so be prepaid for questions when I start my new 55+!!!!!!!!!
newbieplanter is online now   Reply With Quote
Old 03-21-2013, 04:22 PM   #162
latchdan
Planted Tank Obsessed
 
latchdan's Avatar
 
PTrader: (6/100%)
Join Date: Sep 2007
Location: Paso Robles, Ca
Posts: 425
Default

Can this be made a sticky already :P
latchdan is online now   Reply With Quote
Old 03-29-2013, 01:49 AM   #163
veryzer
Planted Tank Obsessed
 
PTrader: (0/0%)
Join Date: Oct 2009
Location: IL
Posts: 300
Default

Hoppy, you said somewhere that one can grow pretty much anything with 50-60 par (I think that's accurate...can't find the source material). Does this include red plants? I'm running with about 75 par right now and am thinking of venturing into these more difficult species. Anyone else with first hand experience feel free to chime in.

Thanks
veryzer is offline   Reply With Quote
Old 03-29-2013, 02:06 AM   #164
Hoppy
Planted Tank Guru
 
Hoppy's Avatar
 
PTrader: (74/100%)
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 18,790
Default

Growing plants doesn't take more than 40-60 PAR, with good CO2, but many of the plants that looks so good when they have red leaves do need better conditions than just that PAR and CO2. It seems that some need light that encourages the red leaves, and all need light with enough red in it to be able to reflect red so you see the color. That isn't true of all red leaf plants, but it seems to be true of some or even many. I will let some one else describe what it takes for that type of plant to look its best.
__________________
Hoppy
Hoppy is offline   Reply With Quote
Old 03-29-2013, 02:41 AM   #165
veryzer
Planted Tank Obsessed
 
PTrader: (0/0%)
Join Date: Oct 2009
Location: IL
Posts: 300
Default

"It seems that some need light that encourages the red leaves, and all need light with enough red in it to be able to reflect red so you see the color."

Yeah, I've heard the same. That seems to be the gripe about finnex and other leds. I have led fixtures with 20% 660nm. I guess the only way to find out is give it a try.

Thanks.
veryzer is offline   Reply With Quote
Reply

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

Forum Jump


All times are GMT. The time now is 01:57 AM.


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