50 watt 120 volt full spectrum led. Needing heat sink.

Ulu

Giant Snakehead
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Those lights look like a great deal for the price. I pay over $5 for std 50watt daylite LEDs with GUI-10 base, but they have a painted heatsink. I don't buy sockets. I just solder the wires to them and insulate with silicone.

They don't produce algae like my cheapo Aqueon LEDs. Every one of those is failing from humidity.
 
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markstrimaran

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The white light have been growing more complex algea. The large pleco has been eating anything growing that's not firmly attached.
 
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markstrimaran

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The mag scraper works, no more green dot algea. That only would come off with a razor blade.

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The soup can heat sinked 50 watt chip is still going.

Adding a 10 watt green makes for a nice white.20190216_162247.jpg
 

Ulu

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Mark, I don't how hot your lights are, but if you cut the distance in half you get 4x the light on the plants.

I keep the lights as close to the plants as possible, raising them slowly as the plants grew taller, or trimming the plants back as required.
 
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markstrimaran

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Mark, I don't how hot your lights are, but if you cut the distance in half you get 4x the light on the plants.

I keep the lights as close to the plants as possible, raising them slowly as the plants grew taller, or trimming the plants back as required.
I was going with a 110 degree light spread. If I go low, the single 50w chip will not cover the 36" x 24" tray.

I am mostly interested in keeping them alive for out door transplant come late spring.

I am running them 12 on 12 off. Would 18 on 6 off be better?
 

Ulu

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I go 16~18 hrs on and keep the lights close if I want lush growth. For maintenance purposes 12 on 12 off is enough.

I was going with a 110 degree light spread. If I go low, the single 50w chip will not cover the 36" x 24" tray
I see the problem. Maybe a DIY reflector/diffuser would help? Fresnel lens from an old parking lamp? LOL I dunno.

But the physics is clear: light intensity rises inversely to the square of distance. Any distance you can move them closer will speed growth, on plants which love light.
 

markstrimaran

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200 watts on a 40" Aluminum bath tub track guide. These are the white chips. The only problem is the wire end terminals are just inserts, which I pop off and hot soder the hot and neutral wires for a fail proof connection.


I watched a guy on YouTube mount 4 of these on a 8" heat sink with 2 fans.

They possibly have a thermal cutoff that limits current at an overheating preset.
 

markstrimaran

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200 watt, I tried it on the tank, but it drove the fish mad, chips were too bright.1363811
 

markstrimaran

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This is the top of the moss ball. Which was red algea under different lighting. After 6 months of the 50 watt cob 120 volt led. About 6" under water. 8 inches from the led.
20190803_121126.jpg
This is one week of new growth on the same chip set. This is about 8" underwater.
I am done with this as a hydroponics light as it seams to have stunted my strawberry plants. After transplanting them out side. None of them have grown much under natural light.
I should note that the spinach grew very well. Just something about strawberries. Maybe a plant disease.
The fish got use to the 200 watt brightness.
 
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