LED Group buy!
- Thread starter that0neguy1126
- Start date
Derek - you can have a couple of my LEDs - since I miscounted, I'm going to have to place a follow up LED only order anyway, so missing a couple more won't bother me. Actually, I may wait a couple of weeks until placing my order everyone gets into their build project and then see if anyone else needs a couple of replacements.
i got a tracking number form him and it never worked but i did get my package about 4 days later. im sure u all will be happy i finished my build 2 days ago and WOW!
180 watt 20 blue 20 super blue 10 warm white 10 crisp white all on dimmers im loving it. The light is about "32 from the bottom of tank and about "22 from the first coral sps do u think this is high enough for a little while i will lower it slowly. Mainly that question is for crit21
180 watt 20 blue 20 super blue 10 warm white 10 crisp white all on dimmers im loving it. The light is about "32 from the bottom of tank and about "22 from the first coral sps do u think this is high enough for a little while i will lower it slowly. Mainly that question is for crit21
Mine bleached in 2 days because they're more powerful than they appear, especially the blues. That's because you get 3-4 times the amount of photosynthetic response with the blues than white. See the chart below. I don't trust PAR meters to accurately measure the PAR of blue LEDs.
I'd advise putting the LEDs at their final height right away, but dimming all of them as far as you can. Increase the intensity a little bit each day over a couple weeks until they're at full intensity.
I'd advise putting the LEDs at their final height right away, but dimming all of them as far as you can. Increase the intensity a little bit each day over a couple weeks until they're at full intensity.
I will post the tracking number as soon as felix gets it. Aliexpress doesn't show it and doesn't show any updates on it.
As far as PAR goes, here is the graph from the meter I am going to buy.
[attachment=59584:name]
Quantum response is from 400 to 700 nm and gives equal emphasis to all photons (Red line). A blue lens filters the light and improves the spectral response (Blue line). So the meter has a blue filter on it to adjust the emphasis given to the photons so the meter behaves more like plant response (Green line). You can see it doesnt match up perfect.
Like Dan stated, it under estimates the blue in the low range.
As far as PAR goes, here is the graph from the meter I am going to buy.
[attachment=59584:name]
Quantum response is from 400 to 700 nm and gives equal emphasis to all photons (Red line). A blue lens filters the light and improves the spectral response (Blue line). So the meter has a blue filter on it to adjust the emphasis given to the photons so the meter behaves more like plant response (Green line). You can see it doesnt match up perfect.
Like Dan stated, it under estimates the blue in the low range.
What I really meant was that PAR meters aren't good at measuring photosynthetic response by organisms. Even if a white and a blue LED had the same PAR reading, it's just a measure of the energy, and not a measure of photosynthetic response. A white LED and a blue LED with PAR readings of 100 doesn't mean you'll get the same response to each LED. You actually get more photosynthetic response from the blue.
My LEDs appear much less bright than my old 400W 14,000K MH, but I get growth that's at least the same as with the MH. The pigmentation is MUCH more pronounced with the LEDs, though.
My LEDs appear much less bright than my old 400W 14,000K MH, but I get growth that's at least the same as with the MH. The pigmentation is MUCH more pronounced with the LEDs, though.
this is about all i have i never took pictures during the building.
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spssps;82338 said:
this is about all i have i never took pictures during the building.
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How far apart are your LEDs and what's the temp of the heat sink?