There are several options from many different prices. For a basic aquarium lighting, LED technology can help.
The idea is to be as simple as possible, at lower cost and provide adequate lighting to the aquatic environment.
It is used as a basic rule the proportion of 1W per liter of water for proper lighting.
My aquarium has 120 liters, 100 liters useful.
Using the rule, it is expected 100W light for the correct illumination.
When searching the Internet, I found led strips, single color (pure white) or RGB, allowing customize the color best suited for your environment.
Are sold in rolls of 5m with 300 leds of the model 5050, and with power of 72W.
Although 72W is less than 100W, I decided to assemble the solution and the result was excellent for my purposes
5 meters of Led strip RGB 5050
5A 12V power supply
1 RGB Controller
They are sold in kits:
1.5 mts Aluminum profile like this.
1 Double-sided tape
50cm - 4 way ribbon wire
I used 1.5m of aluminum profile like a picture above, cut in half and stuck, forming a profile of 75cm with twice the width.
I cut the LED strip into several pieces of 75cm to the same extent of aluminum, and pasted inside.
Thereafter the weld has been made between the multiple pieces of tapes using the ribbon wire.
At the end we can see all the LED tape, several pieces fixed inside the aluminum profile.
After that, turn on the tape with the 12V supply and select the desired color.
Ready light for aquarium simply and inexpensively.