RS Electrical RS-S13 Clip-On LED Lamp (12W) for 30-40cm Aquariums

The RS Electrical RS-S13 is a 12W clip-on LED aquarium light for tanks 30–40 cm long (up to about 2.5 ft), with full-spectrum 5730 LED beads on a 360° flexible gooseneck arm and an adjustable screw clamp that fits rimless and framed tanks. It is a popular, space-saving way to add bright, plant-friendly light to a small or nano aquarium — the flexible arm lets you aim the light exactly where you want it, and the clamp keeps it off the tank rim so nothing intrudes into the water.

Why choose the RS-S13?

• Full-spectrum 5730 LEDs that mimic natural daylight to support plant photosynthesis and vivid fish colour.
• 360° flexible gooseneck arm so you can angle the light precisely across the tank.
• Adjustable screw clamp for glass roughly 3–12 mm thick — clamps onto rimless and framed tanks.
• Space-saving clip-on design that takes up no room inside the tank.
• Long-life, energy-efficient LEDs rated for tens of thousands of hours.

Specifications

Which tanks is it best for?

The RS-S13 suits small and nano aquariums 30–40 cm long, including planted nano tanks and fish-only display tanks. The clip-on form is ideal for rimless tanks where a top-mounted fixture would not fit. It supports low- to medium-light plants; for demanding plants add CO2 and dosing. See our planted aquarium lighting guide and what size aquarium light do I need.

How to use it

Clamp the light onto the rim or back glass, bend the gooseneck to aim it, and run it 6–8 hours a day on a timer (7–8 for planted tanks). Always include a dark night period and keep the tank out of direct sun to control algae. Route the cable with a drip loop and keep the adaptor above water level. See how many hours should aquarium lights be on.

Frequently asked questions

What tank size is the RS-S13 for?

Tanks 30–40 cm long, up to about 2.5 ft. For smaller tanks see the RS-S30 or RS-L8; for similar size with 10000K tuning, the RS-L13.

Does it clip onto rimless tanks?

Yes. The adjustable screw clamp fits glass around 3–12 mm thick, so it works on both rimless and framed tanks.

Is it good for planted tanks?

Yes, for low- to medium-light plants. The full-spectrum 5730 LEDs support photosynthesis and render colour well.

Can I angle the light?

Yes. The 360° flexible gooseneck arm lets you aim the light anywhere across the tank.

How many hours should I run it?

6–8 hours a day on a timer, 7–8 for planted tanks, with a dark night period to limit algae.

Choosing a clip light? Read the complete aquarium light guide and the planted lighting guide.