I have been wanting to upgrade the lighting on my Aquapod 24 gallon. In doing my research, I didn’t find many other writeups on retrofitting this tank with LEDs. I’m not even sure if this tank is being manufactured anymore. I’ve detailed the steps I took to perform the retrofit here for anyone else who owns one of these tanks. Of course, the process should be similar for other pod-style tanks as well.
- ability to independently dim each ‘channel’, that is, blue/white.
- ability to control dimming via Arduino / PWM
- low heat generation
- As OEM – looking as possible (didn’t want a bunch of new wires or holes drilled into the hood)
- Low noise from any active cooling
- Remote power supply and drivers (to reduce cooling need and complexity inside the hood)
I chose to go with a setup from www.stevesleds.com. This system uses tubular heatsinks (square aluminum tubing) and a blower-style fan to achieve active cooling. I liked this because it would allow me to keep the necessary low profile to keep everything contained in the original hood and still use the stock light-cover. I’m sure this could still be done with a standard block-fin style heatsink, but it seems like it would be more challenging.
- 3′ 1.5″ Aluminum heatsink tubing
- 7 Royal Blue Luxeon ES LED
- 4 Cool White Luxeon ES LED
- 3 Neutral White Luxeon ES LED
- 1 Pressurized cooling fan
- 2 Single Drivers (these are manufactured by Steve’s LEDs)
- 1 200w 24v switching power supply
You’ll notice above that I have a mix of two different white LED types. After doing some research on forums such as reefcentral.com and nano-reef.com I noticed that some people like the look of a warmer white than the standard cool whites that are being used (see this thread for a very detailed discussion on LED color aesthetics). After some consideration and viewing both, I found the color temperatures of the Luxeon Cool and Neutrals to be fairly similar. I decided to just use both on the white ‘channel’ in order to give a little more warmth to the color.
This is the hood before installation, 2x 32w Power Compacts:
The thing I really like about the blower fans that come with this kit is that they are easily mounted by removing the cover and drilling mounting holes as appropriate:
Below, you can see the back-side of the hood. I’ve had this tank for about 4 years now, and there is a lot of salt creep inside here. Kind of scary considering that this is all high voltage (for now). I decided to just strip off the ends of the 120v cords and use them to power each channel of the LED setup. This will keep a stock look. All drivers/power supply/controllers will be remote.
The heat sinks were very easy to install into the hood using pre-existing screw holes. I just drilled an access hole into the top of the heatsink (to get a screwdriver through) and a screw hole through the bottom and used hardware scavenged from dis-assembly. And now for the part of the build that I am not particularly proud of, I used JB weld to attach the heat-sink pieces together. Welding the pieces together would have been superior both in terms of structural integrity and thermal management. Frankly, I just didn’t feel like making the effort. I drilled holes through the sides of the adjoining tubing pieces that met at 90 degree angles and capped the end of the tube coming out of the blower-fan with tape. Below you can see the heat-sinks installed and blower-fan mounted. Sorry for the lack of intermediate photographs. As you can see, I also added a piece of scrap aluminum tubing to help with rigidity and as an additional thermal mass.
Below, all LEDs are mounted n the heatsink and wired. The color of the wires does not correspond with anything.
A note about the LED pattern. After reading about color-shadowing issues (the effect of point-light sources of different colors leaving multicolor shadows in the tank) on reef-central, I decided to locate the blue and white LEDs as close to eachother as possible. What you see above are groups of one blue and one white butted (where possible) to one another.
The Power Supply unit:
I lucked out on finding a ‘project box’ for the power supply and drivers. I had an old SFF PC case laying around that I just couldn’t bring myself to throw away. It worked out perfectly in that it’s big enough to put all the components in, and it’s made of aluminum. So it looks good and should be easy enough to keep cool. It’s pretty big, but for this application that will be allright. I plan on adding an arduino to control the drivers via PWM later, so having some extra space will be helpful:
One thing I wanted to mention is that I wired the blower fan in series with the two fans inside the power supply case. That is, the two power supply fans are parallel and then in series with the blower. I did this because while the blower fan has a voltage regulator built in, it gets quite hot when throttling the 24v from the power supply down to the needed 12v. As well, I found that I didn’t need the blower running at full speed to keep things cool. This setup runs very quietly and still moves quite a bit of air. All temps so far seem to be okay so far (haven’t measured exit temps above 90 degrees on the heat sinks).
Here is the setup installed and operational:
I’m very pleased with both the light quality and output of this retrofit. The perceivable brightness has been greatly increased. I would say that running the dimmers at about 50% is about comparable to stock. I have not yet run this setup at 100% for a long period of time (my understanding is that corals should be acclimated to more intense lighting provided by LEDs). Even once the corals are acclimated, I don’t think I’d want to have the setup running at 100% for too long, it’s just a bit too bright for my liking. Besides, this tank is all softies and LPS right now. Also, being able to dim each channel independently is a must-have, in my opinion. Being able to set the color temperature at will is very cool.
I had quite a bit of success with avoiding color-shadowing by placing the whites and blues right next to each other. However, there is still some perceivable color-shadowing in some areas, but it’s not distracting. I think a certain amount of this is unavoidable in a tank like this.
I plan on controlling the dimming via Arduino at some point. The drivers have both the option for potentiometer dimming (as currently setup) or PWM.