Sobo T4-40 Aquarium Submersible Lamp 8 watts

The Sobo T4-40 is an 8W fully-submersible LED aquarium lamp for tanks 40–50 cm long, built to sit underwater inside the tank and deliver high-output light that deepens plant colour and makes red fish, shrimp and red-leaved stem plants stand out. Its sealed, waterproof tube mounts horizontally on suction cups, making it a flexible primary or accent light and a popular value choice for planted and display aquariums in India.

Why choose the Sobo T4-40?

• Fully submersible, sealed design that runs underwater and positions easily low in the tank.
• 8W high-output LED for tanks 40–50 cm, bright for display and easy plants.
• Rich colour rendering that makes reds, greens and fish colours pop.
• Energy-efficient and low-heat, with a long service life.
• Flexible suction-cup mounting for back-lighting or general illumination.

Specifications

Which tanks is it best for?

The T4-40 suits tanks 40–50 cm long. As a submersible tube it is great for bright back-lighting or accent lighting that lifts colour, and as a primary light for low-light plants and fish-only display tanks. For demanding plants, a top-mounted planted light such as the Sobo AL-380 gives more even coverage; see our planted aquarium lighting guide.

How to use it

Fix the lamp inside the tank on its suction cups, fully submerged, and run it 6–8 hours a day on a timer. Always include a dark night period and keep the tank out of direct sun to control algae. Handle and connect it with the power off and a drip loop on the cable. See waterproof and submersible aquarium lights.

Frequently asked questions

Is the Sobo T4-40 fully submersible?

Yes. It is a sealed, waterproof LED tube made to run underwater inside the aquarium on suction cups.

What tank size is it for?

Tanks 40–50 cm long. Larger tanks suit the T4-50; smaller tanks the T4-30 or T4-20.

Can it grow plants?

It supports easy low-light plants and makes plant colour vivid. For demanding plants choose a stronger top-mounted planted light.

How many hours should I run it?

6–8 hours a day on a timer, with a dark night period to limit algae.

Where should I place it?

Mount it low or along the back on suction cups for back-lighting, or position it for general illumination.

Choosing a light? Read the complete aquarium light guide and what size aquarium light do I need.