|01-06-2013 08:23 PM|
yea basically i was just wondering if Lumens meant it was stronger? Like the 2 39W Fulham's i have in my T5HO fixture right now..
If the spectrum is anything like the picture you posted with their higher wattage bulbs, than im assuming the Midday would give me better overall growth..
but not sure?
|01-06-2013 02:37 AM|
Here are a few thoughts I wrote today. They have to do with what you are asking:
|01-05-2013 11:29 PM|
I wonder if the spectrum is the same for Fulham's 39w bulbs i have?
It says it has 3200 lumens, and that the Midday only has 2400 or something like that.
Would that make a difference in growth speed, or would the spectrum do that mostly?
|01-01-2013 05:37 PM|
I currently use a colormax to supplement my red spectrum. Its a far weaker light in terms of intensity. Now I really want to experiment with that purple and mixing green. I'm just worried about intensity and usefulness. Or if its so insanely ugly, maybe I can turn it on when I leave.
|01-01-2013 02:43 PM|
Hm, I didn't know Fulham sold bulbs also.
Found a spec sheet, here it is. Look at page 4 for the spectrums. Nothing to write home about as it seems:
Here it is cut out from the pdf:
The 830 has a lot of reds (and barely present blues) but the reds are in some funky range - 600 nm or so instead of the 640-670 that is good for photosynthesis.
The 865 has blues and reds but in equal amounts. From what I learned posting above the blues need to be more (like 100 units) then the reds (like 50 units). In this bulb both of them are equal and both are barely above 50 units.
It looks like both Fulham bulbs are made more for balanced color to please the human eye - because of the green spike in the middle.
And of course - none of this means they are not good for plants. If we used incandescents with great success back in the day what we are talking about here is not exactly the difference between night and day.
|12-31-2012 02:09 AM|
Very interesting.. I sometimes put my old corallife fixture on the back of my tank which had 2 lights, only about a 3 inch wide fixture and the bulbs put out about 21 watts each..
Anyway, almost as soon as i put that on 5 minutes later the plants start pearling too..
Ive now switched those bulbs to my T5HO fixture and they are Fulham 39w T5HO's, yet i cannot find a spectrum for output for those bulbs anywhere on the internet...
If you are feeling froggy and wanna try looking for that id be in debt to u! lol
|12-30-2012 06:42 PM|
But here's a guess - the photosynthesis is best if the blue is more than the red:
And look at the Colormax bulb spectrum:
Now look at the Giesmann Midday spectrum:
What I see is that the Colormax has much more reds and the Midday doesn't really have reds. The Midday looks like a Colormax minus the reds! Nice. And strange.
So my take on this is pretty simple. The Midday is a T5HO (an 24" bulb is 24 watts). The Colormax is 17 watts for a 24" length. S there is a difference in the intensity. In addition the T5HO are commonly used with individual reflectors. They increase GREATLY the intensity of the light hitting the bottom. So comparing Colorormax which seems to have a fuller spectrum that the Midday may be a question of comparing intensities too.
I wrote the above because recently I got a 30W LED Flood light, 10,000K, with a single EpiStar LED. The LED light color is too white. I use it in conjunction with a 24W Giesemann Midday. Got shocking pearling minutes after turning the LED on. What is interesting is that leaving only the LED leads to reduction of the pearling by about 25-30%. Leaving only the Midday on stops all pearling. It seems that the two lights somehow complement each other and the LED provides the intensity, while the Giesemann provides a better spectrum. Now note that in my LED+Midday setup there aren't many reds. I wonder what would happen if I add reds.
Look at post #16 in this thread for pictures, day by day, with the LED+Midday:
Today, on day 10 of running the LED+Midday and the plants are now making pale leaves because I do not fertilize the water yet. But they still pearl. Last night I also noticed a brand new plant emerging from the gravel - something that had been there waiting for better times. So here I have a tank with lots of light and little reds in the spectrum. But the plants don't mind it. Maybe that's why the fame of the Midday bulb lives on - it is not that it is the best spectrum but it is bright enough and normally used with reflectors that make it blast the water with even more light.
|12-30-2012 03:33 PM|
|switch26||It is interesting if plants use reds so much, wouldn't a Corallife Colormax bulb be the best? Yet ive heard people say the colormax's don't bring as much growth as a giesseman midday?|
|12-30-2012 01:23 AM|
If this is so then I think that the "middle" part of the spectrum (the one that makes the color of the light pleasing to the eye) is not completely useless for the plants. Look at all these graphs for the wavelengths that are best for photosyntesis. They all differ a little from each other. But what is pretty obvious is that between the high blue and red spikes there is also some activity. Meaning that the green light will actually be beneficial to some degree.
|12-29-2012 03:10 PM|
|switch26||Here i edited the image, phone took crappy pic of it|
|12-29-2012 02:00 PM|
Niko, if you get The Fiji Purple and balance the light with green so its viewable, is that slot you used up for balance worth it ? In the example case of a 2 bulb fixture vs 4 bulb etc ?
|12-29-2012 01:14 PM|
Read this thread:
Basically no single light bulb is the best for both plants and the human eye. But it you really don't have to provide the perfect spectrum for the plants. In the old days we grew plants with incandescent bulbs which had never heard of the phrase "blue part of the spectrum".
I personally love the color of the Giesemann Midday bulbs. They do grow plants very, very well. I was pretty shocked to learn that the spectrum is pretty far from what is best for the plants.
|12-29-2012 07:36 AM|
|Smitty06||Can you take a picture of the chart that isn't as blurry? A graph with no increments in useless. From the looks of it though, it seems like it is lacking in the red spectrum.|
|12-28-2012 12:00 AM|
rotala indica, Wallichi, Macrandra, Bacopa australis. Dwarf baby tears, Alternatha reineckii, 1 ludwigia ovalis that died off, and is coming back strong now. Poor shipment of the wrong plant left me with it. Also have blyx japonica which is for some reason not growing very fast at all, or has little growth for the several months i have had it.
Also some xmas moss, and willow moss, but it isn't a ton of it yet. Letting it grow in
The image is of the 6700 bulb i have in my tank.. Im assuming even tho it spikes, that isn't the best? I figured a giesemann midday would give me more strength and less blue's.. Im not concerned about the look so much as i want my plants to thrive and grow properly
|12-27-2012 11:39 PM|
|steven p||What other plants are in the tank.. are they having a bit of an allelopathic war?|
|This thread has more than 15 replies. Click here to review the whole thread.|