PAR Meter - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 10-28-2013, 04:26 PM Thread Starter
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Talking PAR Meter

Hey guys, is there anyone willing to test an LED with a PAR meter for me. I have a bunch of LED's but I have 0 specs on them. I'd be mailing this to you and you can keep it afterword's
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post #2 of 13 (permalink) Old 10-29-2013, 10:23 PM
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To test an LED you need a DC power supply with adequate, but not too much voltage output, and a LED driver, or other method for maintaining a constant current, which will work to give you at least two different currents, like 350 and 700 mAmps. Either you will have to supply those parts, or only someone who just happens to have them will be able to do this.

I'm assuming you really meant an LED and not a light made with LEDs.

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post #3 of 13 (permalink) Old 10-30-2013, 11:04 AM Thread Starter
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[QUOTE=
I'm assuming you really meant an LED and not a light made with LEDs.[/QUOTE]

I am referring to an E27 style bulb wit LED. A plug and play style one. Thus far no one has offered on this forum but on Reddit r/planted tank someone offered I shipped it to him yesterday 1 day shipping so provided he has some time I should be able to get some results soon
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post #4 of 13 (permalink) Old 10-30-2013, 11:48 AM
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show me the bulb, i will measure over the internet
seriously tho, if i can see the led chip in details
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post #5 of 13 (permalink) Old 10-30-2013, 03:19 PM Thread Starter
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These LED's are soldered to a board IDK if that's still usefull
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post #6 of 13 (permalink) Old 10-30-2013, 04:04 PM
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just give an info on the bulb and a pic.
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post #7 of 13 (permalink) Old 10-30-2013, 04:36 PM Thread Starter
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Here are the bulbs I cant take an actual picture at the moment but they are really generic and cheap. they all work though
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post #8 of 13 (permalink) Old 10-30-2013, 09:15 PM
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I've tried 445nm and 660nm Chinese chips. With high probability the same ones inside that bulb. Works really well. My par meter is put a green plant wich turns red in strong light and wait if it does

Using two thirds the luminiscent bulb wattage these led passed the test on two species. One being ludwigia repents green, other don't remember. How do I navigate on iPad through text? There is no arrows on the damn keyboard
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post #9 of 13 (permalink) Old 10-31-2013, 05:12 AM
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Quote:
Originally Posted by dzega View Post
How do I navigate on iPad through text? There is no arrows on the damn keyboard
Yes, that is a problem. If you have steady hands, and not too big fingers, you can tap where you want the cursor to be on the text, and it will appear there, or at least close to where you tap. Personally I don't like using my iPad for typing stuff.

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post #10 of 13 (permalink) Old 10-31-2013, 03:03 PM Thread Starter
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Hmm. interesting, so you believe there is a strong chance these LED's are the same. If so how are you utilizing them. # of bulbs, gallons ect
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post #11 of 13 (permalink) Old 10-31-2013, 05:56 PM
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I used led chips separately. With external driver. That light promoted growth way better than similar wattage sylvania grolux tube wich Is considered being classic of growing light

I can't press in the middle of the word on this damn iPad. Cursor appears at the end of the word no matter where I press. There was no such problem on android tablet
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post #12 of 13 (permalink) Old 10-31-2013, 06:59 PM Thread Starter
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droid for life. and I think these lights are making my plants burn through nutrients. I had to buy some dry fert because with 7 comet feeders in there for nitrates and nitrites I have gotten 0ppm 4 weeks now I had considered not doing 25% waterchanges anymore but ferts are on the way
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post #13 of 13 (permalink) Old 11-04-2013, 11:37 AM Thread Starter
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So that guy from reddit tested my lights heres the results "The light tested at 13 inches from the light - directly under the light is 95umol, and decreases by about 10umol every centimeter from the center (the center circle was about 2 inches wide), finally zeroing out about 4.5 inches or so from the center. "
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