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Search: Keyword(s): ; Posts Made By: Hoppy
Forum: DIY Today, 05:30 AM
Replies: 32
Views: 847
Posted By Hoppy
How does a diffuser flatten out the spectral...

How does a diffuser flatten out the spectral response? That response is largely determined by the basic response of a silicon diode to light.
Forum: DIY Today, 04:35 AM
Replies: 32
Views: 847
Posted By Hoppy
Since this is an obsession for me, today I...

Since this is an obsession for me, today I started thinking about the Excelitas diode again. I found (again) the spectral response curve for it, and blew it up so I could more easily read the...
Forum: DIY 02-28-2015, 11:07 PM
Replies: 32
Views: 847
Posted By Hoppy
We have to keep in mind that we are not looking...

We have to keep in mind that we are not looking to make a PUR meter, but a PAR meter, and that means one that measures all light between 400 and 700 nm, with equal response to all of the spectrum in...
Forum: DIY 02-28-2015, 06:02 AM
Replies: 32
Views: 847
Posted By Hoppy
Assuming you could find a 680 nm cut off filter...

Assuming you could find a 680 nm cut off filter that cost a few dollars each, and used that #3203 filter, you would have a good looking response curve above about 460 nm, but below that the response...
Forum: DIY 02-28-2015, 02:44 AM
Replies: 32
Views: 847
Posted By Hoppy
Those are interesting photodiodes, but the...

Those are interesting photodiodes, but the perfect spectral response is equal sensitivity from 400 to 700, not a slope from 400-700, and to be useful it also needs a IR/UV blocking filter with a...
Forum: DIY 02-27-2015, 08:35 PM
Replies: 32
Views: 847
Posted By Hoppy
I have not been able to get acceptable accuracy,...

I have not been able to get acceptable accuracy, compared to the Apogee PAR meter, for either sunlight or Finnex Planted Plus light. So, I'm going to drop this effort for now, perhaps until I think...
Forum: Fertilizers and Water Parameters 02-26-2015, 06:17 AM
Replies: 17
Views: 390
Posted By Hoppy
If wondering about nutrient deficiencies, trying...

If wondering about nutrient deficiencies, trying to find a way to pinpoint what they are, is fun for you, the PPS Pro method is a good fertilizing method to use. But, if you prefer not to have to do...
Forum: Lighting 02-26-2015, 06:09 AM
Replies: 7
Views: 251
Posted By Hoppy
Ideally you would mount your light about a mile...

Ideally you would mount your light about a mile above the tank, to best simulate the sun as a light source. But, that would present a few physical problems :hihi: The reason for doing that would be...
Forum: DIY 02-25-2015, 06:17 AM
Replies: 32
Views: 847
Posted By Hoppy
Interesting information on IR blocking filters. ...

Interesting information on IR blocking filters. Maybe by using a larger aperture, with a longer distance between filter and diode, it might work better. But, probably at a price.
Forum: DIY 02-24-2015, 07:36 PM
Replies: 32
Views: 847
Posted By Hoppy
Back to the drawing board:icon_frow This morning...

Back to the drawing board:icon_frow This morning I set up the Planted Plus so I could make more accurate readings from it at a distance of about 15 inches. My PAR meter reads about 66% of the...
Forum: DIY 02-24-2015, 03:43 AM
Replies: 32
Views: 847
Posted By Hoppy
DIY PAR Meter - 2015 Version

For the past 2+ months I have been trying to develop a better design for my PAR meters, made from lux meters. My goal was to make one that could give a reasonably accurate reading of the PAR from a...
Forum: Fertilizers and Water Parameters 02-23-2015, 03:11 AM
Replies: 6
Views: 240
Posted By Hoppy
Sometimes GH Booster does a lot of good when...

Sometimes GH Booster does a lot of good when dosed with water changes. My water is pretty soft, from the tap, and most of the year it is almost all river water. The last time I checked the GH,...
Forum: General Planted Tank Discussion 02-23-2015, 02:54 AM
Replies: 6
Views: 340
Posted By Hoppy
If you use high light you need the CO2 bubble...

If you use high light you need the CO2 bubble rate just about as high as you can get it without harming the fish. If you let it run at that high bubble rate at night, when the plants aren't using...
Forum: Plants 02-20-2015, 05:51 AM
Replies: 8
Views: 335
Posted By Hoppy
With 50ish PAR lighting you need Excel, or...

With 50ish PAR lighting you need Excel, or better, pressurized CO2. Otherwise the plants can't grow as fast as the light is driving them to grow. That makes them easy targets for algae. I had a 65...
Forum: Algae 02-20-2015, 04:31 AM
Replies: 3
Views: 235
Posted By Hoppy
What lighting do you use? What brand light...

What lighting do you use? What brand light fixture, what bulbs, etc.? How high is the light fixture from the substrate?

How is your DIY CO2 set up, number of bottles, how often you change the...
Forum: Algae 02-19-2015, 08:28 PM
Replies: 7
Views: 293
Posted By Hoppy
Algae grow best on unhealthy or dead plant parts....

Algae grow best on unhealthy or dead plant parts. If those plant leaves are old, not growing, and beginning to die, algae will quickly colonize them. Typically we cut off the upper parts of plants...
Forum: Algae 02-19-2015, 08:23 PM
Replies: 30
Views: 1,030
Posted By Hoppy
Let's go back to square one! What light fixture...

Let's go back to square one! What light fixture are you using - manufacturer, how many bulbs, what color temperature, etc.? And, what is the distance from the light fixture to the substrate? With...
Forum: General Planted Tank Discussion 02-19-2015, 12:02 AM
Replies: 97
Views: 2,978
Posted By Hoppy
Just to introduce a new thought here: you...

Just to introduce a new thought here: you probably have enough light that the plants are having some difficulty finding enough carbon to grow at the rate the light drives them to. I have the same...
Forum: DIY 02-18-2015, 05:34 PM
Replies: 8
Views: 254
Posted By Hoppy
It is easier to use screws/nails with 2 x 4...

It is easier to use screws/nails with 2 x 4 material than with 2 x 2 material. And, a 2 x 2 frame has almost no resistance to racking loads - side to side loads, which tend to cause the frame to...
Forum: Fertilizers and Water Parameters 02-18-2015, 05:23 PM
Replies: 13
Views: 440
Posted By Hoppy
I agree!!:bounce::bounce:

I agree!!:bounce::bounce:
Forum: Fertilizers and Water Parameters 02-18-2015, 05:20 PM
Replies: 6
Views: 197
Posted By Hoppy
"Low" KH, below 3 dKH, is not a problem. In fact...

"Low" KH, below 3 dKH, is not a problem. In fact many plants do very well with that KH. You don't get more buffering with a higher KH. The water is just buffered to a higher pH if the KH is higher.
Forum: Fertilizers and Water Parameters 02-18-2015, 04:34 AM
Replies: 14
Views: 663
Posted By Hoppy
Only if you also ordered tons of sulphur and...

Only if you also ordered tons of sulphur and powered carbon. You wife might have no problem with that, but mine tends to object when a truck backs up in my driveway and dumps a big load of...
Forum: Fertilizers and Water Parameters 02-18-2015, 04:29 AM
Replies: 29
Views: 823
Posted By Hoppy
There are repeated discussions about ratios of...

There are repeated discussions about ratios of various nutrients, but no evidence that the ratios mean anything. There is lots of evidence that each of the nutrients, including calcium and...
Forum: Fertilizers and Water Parameters 02-18-2015, 04:21 AM
Replies: 13
Views: 440
Posted By Hoppy
The change in pH that means your ppm of CO2 is...

The change in pH that means your ppm of CO2 is 10X higher is the same whatever the KH is. KH is not, by itself a buffer. KH plus carbonic acid, which is one component of CO2 dissolved in water, is...
Forum: General Planted Tank Discussion 02-17-2015, 02:34 AM
Replies: 14
Views: 440
Posted By Hoppy
That pretty well duplicates my experience too. ...

That pretty well duplicates my experience too. But, I feel sure that there are some more delicate fish than I ever keep, so perhaps there are some that can't tolerate this treatment.
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