Lighting an Aquarium with PAR instead of Watts - Page 4
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Old 08-14-2012, 05:15 AM   #46
bluestems
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This is very helpful. Thanks, Hoppy!

ps- what does it mean if an LED specification states "Luminous intensity: 1400mcd or 17.60Lm per LED"
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Old 08-15-2012, 12:16 AM   #47
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mcd is millacandela. http://www.ohmslawcalculator.com/mcd_to_lumens.php
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Old 08-21-2012, 03:36 PM   #48
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Default Led Par @ 35" depth

Thank you Hoppy.Outstanding analysis.

So, if I'm understanding the led chart correctly then; 2-36" TrueLumen Pro fixtures will produce app 40 par at 35" depth ?
Thanks again,
Kim
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Old 08-21-2012, 03:54 PM   #49
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Quote:
Originally Posted by acro12 View Post
Thank you Hoppy.Outstanding analysis.

So, if I'm understanding the led chart correctly then; 2-36" TrueLumen Pro fixtures will produce app 40 par at 35" depth ?
Thanks again,
Kim
That is correct, providing you space them at 2.75 inches apart. If you have them too far apart you only get half of that PAR - what one strip would give you. But, I don't know how far apart that would be - probably several inches. But, then you would get more uniform PAR over more of the front to back depth of the tank.
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Old 08-21-2012, 04:22 PM   #50
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Default truelumen

Thanks Hoppy,

Trying to get a low light on a 220 gal semi planted discus set up.
tank 72x24x30h.

What you think using 4-36" for this kind of set up?
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Old 08-21-2012, 05:23 PM   #51
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having had a 220 with those dimentions and a odyessa 72" 4x80w fixture I can say I wish I had gone with 4 36" fixtures instead... Or at least 2 of their 72" fixtures. Light was excellent but only in a very limited swath under the fixture. Their 72" fixtures come with 3 switches, 2bulb 2bulb and led moons. Id just leave 2 bulbs off in each fixture for lower light. (or go for the afformentioned 4x36"ers)
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Old 08-21-2012, 09:06 PM   #52
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I think tanks 18" or more in front to back depth will do better with two rows of widely spaced lights than one row of more intense light. So, I would use the 4 36 inch long lights, also because shipping 6 foot long lights and bulbs is more risky and expensive than shipping 36 inch long lights and bulbs.

However, if you hang the light a foot or more above the top of the tank, a single row of lights should work fine.
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Old 08-27-2012, 04:03 AM   #53
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Hey Hoppy

I was wondering for that 90 gal tank that I mentioned earlier....which of these planted ballasts from Catalina would work best?

2x54 W
http://www.catalinaaquarium.com/stor...oducts_id=1842

1x54 W
http://www.catalinaaquarium.com/stor...oducts_id=1837

3x 54 W
http://www.catalinaaquarium.com/stor...oducts_id=1638

or do you suggest something different?
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Old 08-27-2012, 05:16 AM   #54
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Quote:
Originally Posted by Gafi View Post
Hey Hoppy

I was wondering for that 90 gal tank that I mentioned earlier....which of these planted ballasts from Catalina would work best?

2x54 W
http://www.catalinaaquarium.com/stor...oducts_id=1842

1x54 W
http://www.catalinaaquarium.com/stor...oducts_id=1837

3x 54 W
http://www.catalinaaquarium.com/stor...oducts_id=1638

or do you suggest something different?
As I pointed out earlier: http://www.plantedtank.net/forums/sh...4&postcount=43 it depends on whether you want high light or something lower. For high light, phone Catalina and ask for a quote on the custom light I described. If you want less than high light, do you want low light, so you don't need CO2, or do you want high enough light to grow anything if you also use CO2?
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Old 08-30-2012, 09:52 AM   #55
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Quote:
Originally Posted by Hoppy View Post
As I pointed out earlier: http://www.plantedtank.net/forums/sh...4&postcount=43 it depends on whether you want high light or something lower. For high light, phone Catalina and ask for a quote on the custom light I described. If you want less than high light, do you want low light, so you don't need CO2, or do you want high enough light to grow anything if you also use CO2?
I have been in contact with them, they are asking which hood I like etc etc etc.....what did you mention about the fixture width....was it 7inches between bulbs? I cant remember nor can I seem to fidn the post
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Old 08-30-2012, 09:53 AM   #56
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nevermind, didnt see the link in your reply....thanks!
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Old 08-31-2012, 01:27 PM   #57
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Quote:
Originally Posted by Gafi View Post
Hey Hoppy

I was wondering for that 90 gal tank that I mentioned earlier....which of these planted ballasts from Catalina would work best?

2x54 W
http://www.catalinaaquarium.com/stor...oducts_id=1842

1x54 W
http://www.catalinaaquarium.com/stor...oducts_id=1837

3x 54 W
http://www.catalinaaquarium.com/stor...oducts_id=1638

or do you suggest something different?

would any of these classify as medium lighting? I'd prefer to avoid the custom order route as them sending it to Canada seems to increase the cost significantly over their prebuilt models.
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Old 08-31-2012, 05:21 PM   #58
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You can hang a multi bulb light high above a 90 gallon tank and get medium light. See the charts in the first post here.
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Old 09-02-2012, 07:13 PM   #59
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Hoppy,

I am still having problems understanding all of this....Is there a simple one that states something a little bit easier to understand?
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Old 09-02-2012, 10:22 PM   #60
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It is a bit complicated, no question, but I don't know how to simplify it any more.
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