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I considered it but after having an easy time mounting the cobs, idk if i want to put lenses on anymore. The mounting equipment for those style cobs usually uses drilled in holes which i cant do in the cooling block..so glue or epoxy again. Now if there is a decent reflector hood i could use i...

It doesnt need to be that sophisticated. I only need 1 timer to run both the cooling loop and lights ~$12. The pump for the aquaponics system runs 24/7. The automatic food dispenser should be in this week. $48 for that. It can give measured amounts at set times and has about a gallon container...

Yea i noticed how much the voltage was higher when cooled with water compared to just sitting on the aluminum block. Its huge. Like 10% higher voltage. And very good light coming from them. I didnt do much other than different loads on the cobs. Haven't even checked the amount of light coming...

Finally i've got some better cobs. 4000k gen 5 citi cobs. 3 of them mounted to an aluminum heatsink. This time no epoxy lol. The heavy thick chinese cobs needed a lot to hold them up good to the aluminum. These are so light and thin that it just took a tiny bit of super glue to hold it up...

From what ive heard from computer water cooling apparently the aluminum still suffers from corrosion with water i cant seem to find the rate that it corrodes or much info to prevent it other than mixing things such as antifreeze like propylene glycol which ironically i already have to make...

I have now added the radiator. The fish really like the heat coming off of it lol. I highly recommend this as a way to put the heat into the water without worrying about clogging up the cooling loop. The water in the coolant loop is neutral ph water so the aluminum cooling block and aluminum...

Cheap is what i was going for, then automation, now efficiency. But i can break down the pricing of equipment and where to acquire them in good detail. I'll start building the next grow bed within a week or 2 so i can have a bunch of pictures. Hardest part is initial setup but now it is pretty...

Luckily everything will be aluminum and the pump only has plastic in contact with the water so no worries there with different metals. Pretty much everything is made for computer cooling use so they are all either stainless steel, copper, or aluminum. Aluminum is the cheaper and more common for...

Not really much available that wont take excessive time and/or money. 2 part epoxy is cheap and easy to apply. Mix together and apply all around the edges of the cob to the heatsink. You could lift the entire Assembly by the cob and it would hold up. Just make sure the cobs you have on there are...

I would say its good but it could always be better. This project has more hours invested than money lol. I wanted to make this system completely automated as well. That board mounted above the water in the tank used to have equipment but now will have an automatic fish feeder dispensing food to...

@wietefras id be using the 115v efficiency line at 30% to 50% load depending on the cobs. Cheapo chinese around the 50% mark and cobs like the 5000k 3590 DD bin at 30% load. So between 92.5% and 94.5% efficiency(half a percent lower than the chart for the 54v version as id be using the 36v). Not...

Speaking of wall plug efficiency, what is the highest efficiency power supplies you have seen? Ive seen 92-93% but they are super expensive and usually only 100-200w or so. I have a 350w power supply that is good for high 80's for most wattages and was fairly cheap. I guess its cost vs savings...

No. These are definitely 5000k cobs ive been running. Thanks for the link. I'll be checking that out

Does any supplier even have a DD bin of the cree cxb3590? I swear every good one is more rare than bigfoot sightings. I can find the high bins of 3500k leds all day but ask for a 4000k or 5000k and suddenly nobody has anything or ridiculously long lead times. Honestly at this point i'd pay...

I was running way lower than .721a to get over 150lumens per watt lol. A little over .3 amps at 29.2v got me 158lumens a watt with the water cooling...very low wattages.

Yea i looked at it and it does have a nice mounting and is well built but i dont think it would improve what i have either. The next iteration will definitely be closed loop and i will coil the loop around the edges in the tank to spread the heat evenly through it and i should be good from here...

I do want to run an idea by everyone though. I saw a video before of someone that submerged an led cob in mineral oil completely and pumped it through to cool it off. This should cool the surface and the entire cob to the same temperature all around. Maybe i could make an acrylic container that...

Btw i am open to any and all suggestions to improve efficiency and increase output power while keeping in mind cost effectiveness as well. @mahiluana - i considered different specific light spectrums but getting the perfect ratios that will work for each plant was getting quite complicated. And...

I was just thinking of doing that... Unfortunately before i could do it the line got clogged because i dont have a fine filter and the lines to the heatsink are only 1/4" thick....those cobs burnt out fairly quickly without water flowing through the block. Ive got tons of spare cobs though and...