The other lighting upgrade I made back in March was to switch over to Reefi Uno Pro 2.1 for my main lighting. As you can see below, I use angle aluminum running down the middle of the tank to hold the primary lighting sources - which prior the upgrade were 2 120W LEDZeal Alpha 120 fixtures and a 250W halide pendant running a 14K bulb. Since these fixtures are all different sizes, the track holds the halide pendant, and I riveted together a cage to hold the LEDs in place and fit in the same track.
It's a shame I don't see LED Zeal around more, they were really fantastic lights for me. About the layout and selection can be found here:
https://www.reef2reef.com/threads/ledzeal-alpha-120-spectrum-selection.664150/
I did some PAR testing with the Photone app (free, for the most part) and saw one of the LED units was running 500 directly below it on the water surface and the other was up around 800. My assumption was some of the diodes were wearing out after 6 years of use. I wasn't sure if the diodes would be easily replaceable or not, so went with the Reefi lights to ensure I wouldn't be out of luck if it didn't work out.
but first I had to put together cages for the Reefis, below will give you an idea. Not hard work, just a bit tedious!
First impressions on the Reefis were they had far superior coverage to the circular can style Alpha 120s, fantastic spectrum too. With the LED bars added to the canopy in my last post I also needed better coverage from my primary lighting source - hence the upgrade.
Reefis were also 1000% easier to program... the Alpha's use a pretty crappy app that is finicky and the Reefi use a simple browser that is very intuitive. But a big bummer on the Reefis was that one unit suddenly stopped working last weekend so it has sent back in for maintenance. Daniel was super responsive to my message (like within an hour or so) and I am not dissuaded on my purchase. In the interim I put the brighter of the two Alpha 120s and took the opportunity this morning to work on the dimmed diodes.
If you look closely, you can see some the diodes are black and some of the lenses are browned a little bit - likely from running too hot. The Alphas have both active and passive cooling, so my next step was to see how I could access the board.
Turns out accessing the board was super simple, the bezel unscrewed with then a lens cover that slid off.
After pulling the lenses off I got a better look at the diodes. They still worked but had internal lenses that were all highly darkened. After I pulled them off there was not very much thermal paste behind them at all which I suspect caused the inner diodes to run too hot.
I had ordered some 450nm 5W LEDs from eBay some time ago and these diodes were all royal blue. Swapping them out was super easy with a soldering iron (flux is your friend here) and below is the end result:
I decided to leave lenses off the middle 4 diodes - both to eliminate some of the hotspotting that happens in the middle of any array and for any help with heat management.
Here is the light with a couple sheets of paper to make the colors visible once I was all done:
Not too bad for an hour long Memorial Day project!
I plan on keeping the Alphas around - as a can form factor it’s nice to have the option for a pointable light source for highlighting should the need arise.