Aquarium lighting serves two purposes: showcasing your fish and, in planted tanks, driving photosynthesis. The right choice depends on whether you keep live plants and what visual effect you prefer.

LED fixtures dominate the modern hobby because they are energy efficient, produce little heat, last for years, and come in a wide range of price points. Basic LED strips or clip-on lights work well for fish-only tanks where the goal is simply to illuminate the aquarium attractively. Many affordable units offer adjustable color temperatures so you can shift between crisp daylight and warmer tones.

Planted tanks need higher-output LEDs with a spectrum tuned for plant growth, generally in the 6500 to 7000 Kelvin range that mimics midday sunlight. Full-spectrum planted lights with sufficient PAR (photosynthetically active radiation) at substrate depth support carpeting plants and demanding species. Budget planted lights handle low to medium light plants like java fern, anubias, and crypts without issue.

A timer is essential regardless of the fixture type. Set your lights for 6 to 8 hours daily for fish-only setups and 8 to 10 hours for planted tanks. Consistent photoperiods reduce stress on fish and help prevent algae blooms caused by excessive light exposure.

Avoid placing the tank in direct sunlight as a substitute for artificial lighting. Sunlight is difficult to control, creates temperature swings, and almost always leads to severe algae problems.

Some LED systems include a gradual sunrise and sunset ramp feature that mimics natural light transitions. This reduces the startle response fish experience when lights snap on suddenly in a dark room. Moonlight or dim blue night modes let you observe nocturnal species without disrupting the rest cycle.