My take on DIY is:
- the lights and automation controllers are the most expensive side of the hobby. For a large tank, the comercial lights are as expensive as the rest of build, tank/cabinet/sump included.
- to fit small or odd shapes and personal preferences, sometimes compromise need to be made (this is, having to put up with undesirable things - for me it's the green, photo red and sometimes cyan leds in all top fixtures).
- warranty times are a big no-no for a reef tank, the only option is to buy replacement lights while waiting. For a diy, I have always spares on my hand for a quick repair.
- the diy time is simply priceless. Therefore, I could take on the task of doing a light for a friend, but i could never sell my lights, unless I would decide to let go a tank, in which case they would go together (if the light is made custom for a tank, it makes sense to go with it).
I have asked myself this question:
Can I make myself something similar to AI Hydra52HD in terms of lighting quality with a fraction of the price?
The start was a 2400x600x600mm / 8x2x2 in feet / 96x24x24 in inch.
The lamp would have to match three AI Hydra52HD or six AI Hydra26HD. Or 12 AI Prime HD.
Then it hit me - 12 AI Prime HD have a better spread than three AI Hydra52HD according to BRS TV.
That's why the 12led 4channel configuration with three leds on each channel. I have chosen the close grouping of leds to minimise the disco effect, and the small number of leds on each chip to minimise the spotlight effect.
To achieve the best balance between price and quality / efficiency I have decided for four types of leds: Cree XTE Royal Blue, Cree XTE Cool White/Neutral White/Warm White, Cree XPE2 Blue, Semileds 420nm.
For the look, I'm going for a sandwich approach, with a finned heatsink covered with a fine sheet of aluminium and three Noctua Industrial fans. On top of the sheet there is room for all the electronics (Meanwell LDD-H and SCW drivers, BlueFish Mini controller, any fan boards and temperature sensor boards etc.). All is then enclosed in a single aluminium sheet enclosure bent in straight angles. For the front cover, I am considering cast acrylic with a frost effect as a light diffuser. No lenses will be included, as the light will sit low over the tank at 6 -12 inches.
This is the concept:
The cover with the 90° bends and perforations.
This is a lateral view:
The visible wiring will be made with ribon cable, the metal crossing ones with round multi-core cable (for better insulation). I will try to waterproof the led side and the electronics with liquid electric tape. The fans will have to be exposed to potential splashes, but they are IP52, long-life (MTBF 150,000 hours), long warranty (six years) fans.
For the power supply, I will use a MeanWell 48V, probably HLG-600H-48B.
What could be done to make it more energy efficient?
Probably paying a premium for the Cree XP-G3 leds for Royal Blue and White leds instead of using the Cree XTE.