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Topic Review (Newest First)
11-27-2012 01:58 PM
houseofcards
Quote:
Originally Posted by jgc View Post
agreed - everything we do is an estimation. More of an art than a science. PAR in Air gives us a good comparable baseline.

That said, I now have I week with the Ray II on my tank. While much less light than my HQI Metal Halide - I am getting much better growth with the Ray II than I expected (abet I expected to see plants gradually melting away - so any growth is much better than I expected). Lots of new shoots and leaves. Makes me more optimistic.
Just keeping it real, but yes I agree. That's good to hear that your getting growth after the switch. What kind of plants are you growing?
11-26-2012 05:17 PM
jgc agreed - everything we do is an estimation. More of an art than a science. PAR in Air gives us a good comparable baseline.

That said, I now have I week with the Ray II on my tank. While much less light than my HQI Metal Halide - I am getting much better growth with the Ray II than I expected (abet I expected to see plants gradually melting away - so any growth is much better than I expected). Lots of new shoots and leaves. Makes me more optimistic.
11-21-2012 06:21 PM
houseofcards
Quote:
Originally Posted by jgc View Post
In addition to the refraction of the light as it enters the water (essentially creating a lens), there is now a water/glass rather than an air/glass interface which I suspect reflects more light (plus that light is at a different angle when it hits the glass causing greater reflection).
meh.. you can throw a lot of science on this, but home aquariums are not controlled science experiments. Any manufacturer will state their highest, most desirable numbers in a controlled setting, but it's really not 'real life' In the same way my car is suppose to get 40 mpg, but only get's 30. I guess the auto manufacturer forget that in real life people don't drive in wind tunnels, and they don't keep a constant speed of 50. And the biggest surprise is they actually have other people in the car too. On thing your forgetting is the tank the light goes on is not empty there will be hardscape and other plants in the way, there will be surface movement and water that isn't crystal clear like the air. Some light can also be reflected up and out or away from the plants. So give me PAR through air and an empty tank and I'll give you a Jeep that think's it's a Prius.
11-21-2012 06:02 PM
houseofcards
Quote:
Originally Posted by Hoppy View Post
...I found that the intensity with water is a bit higher than without water. Eventually I figured out that the air to water interface acts to slightly focus the light, increasing the intensity, plus, for most tanks, you get some light reflected off the front and back glass, which also increases the intensity. After that I started just measuring PAR out in the air.

All we are doing is stating that a light which produces XX PAR at YY distance, in air, will give you low or medium or high, etc. light in a tank that has the light YY distance from the substrate. Of course in a tank of water, even with no plants, the PAR varies a lot from one location to another in the tank.
So why do those fishes under the water develop their own light systems. What the sun doesn't have enough PAR, LOL. So at what point does water hinder light intensity rather than enhance it?
11-21-2012 05:34 PM
jester56
Quote:
Originally Posted by Oxl View Post
I've been eyeing that light fixture, nice thing about it is that it is so narrow that it would be simple to add more units if one proves to be insufficient.
I have 2 36" Ray II fixtures on a 50 gal. Only drawing 29 watts for the daylight 290 LED model, these things throw an awesome amount of light. After what Hoppy said, I'm considering hanging mine from the ceiling. Radiant heat is almost non existent. I can pick one up in the center and it is barely warm. I'm a fan!
11-21-2012 04:45 PM
jgc In addition to the refraction of the light as it enters the water (essentially creating a lens), there is now a water/glass rather than an air/glass interface which I suspect reflects more light (plus that light is at a different angle when it hits the glass causing greater reflection).
11-21-2012 02:57 AM
Hoppy
Quote:
Originally Posted by houseofcards View Post
Aren't those readings based on a tank without water?
I did some experimenting back when I first got to use a PAR meter. I found that the intensity with water is a bit higher than without water. Eventually I figured out that the air to water interface acts to slightly focus the light, increasing the intensity, plus, for most tanks, you get some light reflected off the front and back glass, which also increases the intensity. After that I started just measuring PAR out in the air.

All we are doing is stating that a light which produces XX PAR at YY distance, in air, will give you low or medium or high, etc. light in a tank that has the light YY distance from the substrate. Of course in a tank of water, even with no plants, the PAR varies a lot from one location to another in the tank.
11-21-2012 12:36 AM
scotty82
Quote:
Originally Posted by Kai808 View Post
How about an early Christmas gift? Check out the Black Friday deals.

http://www.plantedtank.net/forums/sh...d.php?t=197885


http://www.aquavibrant.com/index.php/specials.html

Yes!!! I will be one of the guys that gets up at 1am to get one of those.
11-21-2012 12:00 AM
Kai808 How about an early Christmas gift? Check out the Black Friday deals.

http://www.plantedtank.net/forums/sh...d.php?t=197885


http://www.aquavibrant.com/index.php/specials.html
11-20-2012 10:06 PM
scotty82
Quote:
Originally Posted by houseofcards View Post
Aren't those readings based on a tank without water?
Yes, but from what I've read about the values they don't seem to drop much at all going through water. Well not at least just 20" or so of water.
11-20-2012 10:04 PM
scotty82
Quote:
Originally Posted by Hoppy View Post
Show your wife what a great guy you are by offering to let her buy what she wants for Christmas, and, of course you will relieve her of the worry of finding something you will like, by buying what you want for Christmas. This has worked extremely well for me.
I wish it was that easy. I tried that 2 years ago and she said it's not fun doing it that way. But after last year I think I'll try it again and say "see this way we wont spend money on anything to just sit in the closet and collect dust."

I'm sold on the ray 2 thought. The only thing is I wish it had 4-6 "moonlights" for night time.
11-20-2012 07:32 PM
Oxl I've been eyeing that light fixture, nice thing about it is that it is so narrow that it would be simple to add more units if one proves to be insufficient.
11-20-2012 07:16 PM
houseofcards Aren't those readings based on a tank without water?
11-20-2012 07:06 PM
BriDroid
Quote:
Originally Posted by scotty82 View Post
...now I know what I'm going to ask the wife for Christmas.
Same here, I'm getting one for my 72 bow front (almost same dimensions as your 75, but with a curved front). From all the research I've done on here and Google, it seems like it's the way to go!
11-20-2012 05:40 AM
Hoppy
Quote:
Originally Posted by scotty82 View Post
Now I know what I'm going to ask the wife for Christmas.
Show your wife what a great guy you are by offering to let her buy what she wants for Christmas, and, of course you will relieve her of the worry of finding something you will like, by buying what you want for Christmas. This has worked extremely well for me.
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