RS Electrical RS-S40 Clip LED Aquarium Light 12 watts
The RS Electrical RS-S40 is a 12W clip-on LED aquarium light for small-to-medium tanks, with a flexible arm and an adjustable clamp that attaches securely to the rim or back glass. Well-sealed and durably built, it delivers brighter output than the 8W RS-S30 while keeping the same space-saving clip design — a convenient lighting upgrade for planted and fish-only tanks, with white and white-blue looks for added visual appeal.
Why choose the RS-S40?
- 12W output for brighter light across small-to-medium aquariums.
- Adjustable clip clamp that fixes firmly to the tank rim or back glass.
- Flexible positioning to aim the light where you want it.
- Supports fish and plant growth with bright, even illumination.
- Well-sealed, durable build and a space-saving footprint.
Specifications
| Brand | RS Electrical |
| Model | RS-S40 |
| Power | 12 watts |
| Type | Clip-on LED |
| Mounting | Adjustable clip clamp |
| Best for | Small-to-medium aquariums |
Which tanks is it best for?
The RS-S40 suits small-to-medium aquariums where you want a brighter clip light. For a smaller 8W version see the RS-S30; for full-spectrum planted growth with a flexible gooseneck see the RS-S13. See our what size aquarium light do I need.
How to use it
Clip the light onto the rim or back glass, aim it across the tank, 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. See how many hours should aquarium lights be on.
Frequently asked questions
What tank size is the RS-S40 for?
Small-to-medium aquariums. For smaller tanks the 8W RS-S30 is a better fit.
How is it different from the RS-S30?
The RS-S40 is 12W for brighter output on slightly larger tanks; the RS-S30 is 8W for small and nano tanks.
Does it clip on easily?
Yes. The adjustable clamp fixes securely to the rim or back glass, keeping the inside of the tank clear.
Is it good for planted tanks?
It supports plant growth with bright light. For dedicated full-spectrum planted growth, consider the RS-S13.
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.
Choosing a clip light? Read the complete aquarium light guide.
Shipping & Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.
We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.
Shop The Full Collection