Energizer 4W S15 LED Strip Tube 221mm - Warm White 2700K

The Energizer 4W S15 LED strip tube is a 221mm linear lamp producing 350 lumens of 2700K warm white light through a frosted polycarbonate tube. The S15 base (15mm diameter single-pin fitting at each end) is designed for dedicated strip tube fittings commonly found in under-cabinet lighting, bathroom mirror lights, and picture lights. At 4W consumption, the tube replaces older 30W incandescent strip tubes while running cooler and drawing significantly less power.

The tube suits under-kitchen-cabinet installations where task lighting is needed over worktops, bathroom mirror surrounds where shadow-free face lighting is required, and display shelf lighting where directed wash light picks out objects without glare. The 240° beam angle spreads light widely along the tube length rather than concentrating it in a narrow cone, making it effective for illuminating horizontal surfaces. The non-dimmable design means the tube operates at full 350 lumens whenever powered, without compatibility concerns over dimmer circuits.

The frosted finish diffuses the LED elements inside the tube, preventing visible hot-spots and creating a continuous line of light along the 221mm length. At 25mm diameter and 50g weight, the tube fits standard S15 strip light housings without requiring modification. The 2700K colour temperature sits at the warmer end of the white spectrum, producing light that appears slightly amber-toned and pairs well with traditional interiors, wooden cabinetry, and warm-painted walls.

Energy Class F indicates moderate efficiency within the current EU labelling scale, where LED products now occupy the A-G range following recalibration. Energizer backs this tube with a 15-year lifespan claim based on typical domestic use patterns of 2-3 hours daily.

What fitting does an S15 tube require?

S15 refers to the 15mm diameter single-pin base at each end of the tube. The tube requires a dedicated S15 strip light fitting with spring-loaded pin sockets at each end. These fittings are common in under-cabinet lighting kits and bathroom mirror lights, but S15 tubes will not fit standard bayonet or Edison screw lamp holders.

Can this tube be used in a dimmer circuit?

No. The tube is non-dimmable and will operate at full brightness whenever powered. Fitting it to a dimmer circuit may cause flickering or failure to light, and could shorten the tube's lifespan.

How does 350 lumens compare to the old incandescent version?

Energizer rates this tube as equivalent to a 30W incandescent strip tube. In practice, 350 lumens provides sufficient task lighting for under-cabinet worktop illumination in kitchens and vanity mirrors in bathrooms, but is not bright enough for primary room lighting.

What is the expected lifespan?

Energizer claims a 15-year lifespan based on average domestic use of 2-3 hours per day. Actual lifespan will vary depending on how many hours per day the tube operates and the ambient temperature of the fitting.