LED lights v fluorescent - Page 3 - Tropical Fish Keeping - Aquarium fish care and resources
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post #21 of 24 Old 04-03-2012, 01:49 PM
Thumbs up Fluorescent Lighting

As my consideration there is no big difference between LED & Fluorescent Lighting. I think they both are the best options for aquarium lighting & not a big difference to consume power between both
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post #22 of 24 Old 04-03-2012, 02:38 PM
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Originally Posted by ashtricks View Post
I am planning a long term project. A big discus tank, and for that I have been researching into LED lighting systems. I have definitely ruled out commercially available modules because:
1. They are expensive and
2. I won't get the flexibility in lighting schemes that I can easily achieve by a DIY LED system.
Currently I have a marineland LED the I got the the 20 gallon, and I have a 10 gallon running on CFL (13 W). Hands down plants under the CFL are doing much better. But I know I will be able to get a combination of LEDs that will give me similar spectrum to a CFL or a fluorescent light. As mikaila mentioned earlier, Cree LEDs are good quality.
I found this link jcardona1?s Wild Discus Biotope (2) [T A G] which describes a very elegant LED system. I dare not say it is DIY as you will need a significant electronics knowledge to build one yourself. A slightly expensive but cheaper than commercial LED systems option is to get modules. For any high power LED system, you need 3 modules.
1. A power supply
2. A constant current LED driver (some times 1 and 2 come as a single module)
3. LED modules. (some times 2 and 3 come as a single module)
All of these can be bought on Electronic Components Distributor | DigiKey Corp. | US Home Page (I don't advertise for digikey, but they are the best place to find all the electronic components in the US.)
If you are careful enough in selecting the components, requirement of fans and heat sinks can be kept away from the aquarium. The heat is generated in the driver circuits and not the LED itself (compared to other lighting options).

Considering that LED lighting has found a stronghold in high light requiring markets like street lighting, architectural lighting, car headlights etc, I feel it is just a matter of picking up a ready made module that suits the requirements as an aquarium light and putting it to use.
I am really looking forward to build a circuit that will allow me to simulate sunrises, sunsets even cloudy days using LEDs.

PS: I am just an electircal engineer trying to relive my soldering days. :D
I built a DIY LED Aquarium light from scratch, without using modules, but I have to disagree on the heat.

True high power LEDs will require a heatsink, which by definition means they are generating heat. Less than a CFL for sure, but still significant enough that it needs heat dissipation. High heat = lower lifetime.

I used two on a 20g tall tank, they are working fantastic for plant growth. I even have a Red Tiger Lotus that's going nuts putting out nice deep red leaves.

Custom LED Aquarium Light Fixture – Geo's Aquarium
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post #23 of 24 Old 04-03-2012, 04:05 PM
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True high power LEDs will require a heatsink, which by definition means they are generating heat.

Read more: http://www.tropicalfishkeeping.com/a...#ixzz1r0cN8ELx
Oh Yes! It does require heat sink no doubt. There are high power LEDs available with thermal resistance as low as 2.5 degC/W. They still will need a heat sink, but I think (I have not done the thermal calculations yet) the need for a fan on top of the aquarium can be avoided by a careful PCB and heat sink design. Simplest way is to make heat conducting vias behind the LED mount to conduct the heat to the back of the PCB to attach a heat sink.
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I used two on a 20g tall tank, they are working fantastic for plant growth. I even have a Red Tiger Lotus that's going nuts putting out nice deep red leaves.

Custom LED Aquarium Light Fixture – Geo's Aquarium

Read more: http://www.tropicalfishkeeping.com/a...#ixzz1r0e2uJzP
Sweet! Which LED did you use?
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post #24 of 24 Old 04-03-2012, 04:44 PM
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Bridgelux is the brand, part number BXRA-56C0700-A-00
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