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Old 07-27-2012, 11:05 PM   #196
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Quote:
Originally Posted by Lowe View Post
They just sent me that data. I'm putting in graph form now. And yes, for shallow tanks it's looking like too much light
any official par on the 36" ray2?
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Old 07-29-2012, 08:54 PM   #197
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Quote:
Originally Posted by sayurasem View Post
any official par on the 36" ray2?

http://i46.tinypic.com/14wsrcx.jpg
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Old 08-09-2012, 08:40 PM   #198
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Does anyone have any PAR info on something like this http://www.ledtek.com.cn/led-Spotlig...-bulb-4x1w.htm
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Old 08-13-2012, 05:23 AM   #199
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Default Need advice to make final decision please

Found my answer. Thanks for making all this information available.

Last edited by rvel; 08-13-2012 at 07:55 PM.. Reason: Found the answer
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Old 08-17-2012, 07:26 PM   #200
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Default My PAR measurements for a Marineland 18" - 24" Double Bright LED

Just measured my Marineland 18" to 24" Double Bright with a PAR meter and got seriously low readings.

For "reference":

The tank is 10G. 20"L x 10"W x 12"H
The substrate is 3" @ highest point and 1" @ lowest sloping diagonally.
Glass lid (required for this fixture) on top and it has a brown opaque hinge at the center...
The fixture is centered on top and mounted on the tank's edge (as close to the lid as the mounting legs will allow it)
Water level up to the rim.
Apogee PAR meter QMSS-ELEC

I am not an expert in measuring PAR and what I did is place the sensor in the tank and kept it upright. Also the PAR meter is not mine so I can't say when was it last calibrated, etc.

On the corners: 005-008
front and back sides: 012-015
left and right sides: 008-011
Center lengthwise: 025-034

Like I said before, these measurements may be off since I am not an expert and can't vouch for the instrument's calibration but my plants do show signs of inadequate PAR.
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Old 08-17-2012, 07:29 PM   #201
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The electric meter probably isn't accurate with the LEDs, so the numbers could be low. They seem about right to me though.
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Old 08-17-2012, 09:59 PM   #202
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Does that brown hinge get in the way of the light? A useful measurement would be with no glass cover on the tank to compare with what you got.
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Old 08-17-2012, 11:32 PM   #203
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The hinge does block the blue LEDs in the center...

Without glass lid I am getting about the same measurements except directly underneath the fixture

On the corners: 005 - 011
Front and Back sides: 012 - 015
Left and right sides: 010 - 012
Center lengthwise: 020 - 054

The Center lengthwise fluctuated a lot and within very short distances. It would be over 50 right under the center of the fixture and then a little bit to the right or left of that it would be somewhere in the 20s. Then 30s or 40s as I moved the sensor underneath the group of LEDs on either side and then 10s on the tank's edge... for example [10-34-20-54-24-38-14].
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Old 08-18-2012, 01:17 AM   #204
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That fluctuation means you get "spotlighting" with that fixture at that distance. Either the LEDs have optics or they are spaced too far apart. With any LED light there will be a fluctuation in intensity as you move from directly under one LED to directly under the next one, but that fluctuation shouldn't be that extreme, in my opinion.
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Old 08-18-2012, 06:43 AM   #205
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rvel, check out this thread: http://www.plantedtank.net/forums/sh...d.php?t=134094
the op had 2 double brights on top of his 12g and ended up using just one around 8" above the top of the tank.

raising yours up would at least help to reduce the fluctuation of PAR across the substrate
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Old 08-18-2012, 07:54 AM   #206
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Thanks guys for your replies. It is my understanding that the longer ones like the 36" used in the thread link S&KGray posted are better that the short one. In my case, I decided that this fixture doesn't work for me. It requires a lid because it is not resistant to water at all and that makes summer temperatures hard to deal with. Also I wanted a more uniform spread at the substrate but being so close to the top this will not happen and by rising it higher I lose PAR which is already very low in some areas of the tank... And most important, my plants don't like it.
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Old 08-23-2012, 06:43 PM   #207
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any par info on these two:

Archaea SLIM-PRO Aquatic Plant LED fixture

and the new Aquaksy

Thanks for a very informative thread!
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Old 08-24-2012, 06:43 PM   #208
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The finnex ray II, I dont see any par values for a 36'' fixture. I was trying to estimate it but I cant lol. Can anyone help me?

Finnex Ray II
PAR Data(Source) PAR vs. Distance from source
16" fixture: 130 PAR @ 6", 49 PAR @ 12", 27 PAR @ 18"
18" fixture: 153 PAR @ 6", 72 PAR @ 12", 37 PAR @ 18"
24" fixture: 179 PAR @ 6", 87 PAR @ 12", 55 PAR @ 18"
Notes: Great value priced fixture for various sized tanks. It's a good idea to check out the source link on this one, gives offset PAR values so coverage can be approximated. One of the easiest to read PAR charts i've seen. Big thanks to Lowe for the data on these.
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Old 08-31-2012, 03:11 PM   #209
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Quote:
Originally Posted by mcqueenesq View Post
The mounting brackets and hardware are included with the GroBeam 500 (12w 6500K). I have a couple that I'm currently using for emersed tanks. I'd definitely like to see PAR readings. They're significantly brighter than my Marineland Doublebright, but nowhere near my TruLumen Pro Strips. And the GroBeams look like 2x4's compared to the Pro Strips.
Hi mcqueenesq,

Are you saying that 2 grobeam 500's are not as bright as one truelumen pro? (to your eyes)
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Old 09-01-2012, 08:41 PM   #210
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Quote:
Originally Posted by samamorgan View Post
PAR Values(Source) - Thanks Gnomecatcher for the suggestion!
Values between 10-30 are considered low light.
Values between 30-80 are considered medium light.
Values between 80-120 are considered high light.
Keep in mind that these values are what is currently accepted by the community as accurate, and aren't set in stone.

Finnex FugeRay
PAR Data(Source) PAR vs. Distance from source
10" fixture: 49 PAR @ 6", 18 PAR @ 12", 9 PAR @ 18"
12" fixture: 62 PAR @ 6", 25 PAR @ 12", 13 PAR @ 18"
Notes: Amazingly low cost for an LED fixture that puts out medium light for nano tanks. Nice slim design, too. It's a good idea to check out the source link on this one, gives offset PAR values so coverage can be approximated. One of the easiest to read PAR charts i've seen. Also comes equipped with blue moonlights. Big thanks to Lowe for the data on these.

Finnex Ray II
PAR Data(Source) PAR vs. Distance from source
16" fixture: 130 PAR @ 6", 49 PAR @ 12", 27 PAR @ 18"
18" fixture: 153 PAR @ 6", 72 PAR @ 12", 37 PAR @ 18"
24" fixture: 179 PAR @ 6", 87 PAR @ 12", 55 PAR @ 18"
Notes: Great value priced fixture for various sized tanks. It's a good idea to check out the source link on this one, gives offset PAR values so coverage can be approximated. One of the easiest to read PAR charts i've seen. Big thanks to Lowe for the data on these.
The source link for these two fixtures links right back to this thread. I would like to see the source link for these fixtures.
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