Osram Lumilux T5 HE 21W Fluorescent Tube

An Osram Lumilux HE (High Efficiency) T5 fluorescent tube, 21W, G5 base — an efficient slim tube for office and retail ceiling fittings.

Will this fit my fixture?

Replacing an identical existing 21W G5 T5 tube is straightforward once power is off. New fittings need an electrician.

Key Features

• Slim G5 base, 16mm diameter T5 tube
• High Efficiency (HE) range — up to ~97 lm/W
• Available in 830 Warm White, 840 Cool White, and 865 Daylight

Technical Specifications

Applications

• Office and retail ceiling lighting
• Commercial fittings prioritising energy efficiency

FAQ

• Will this fit my fixture?
  If your existing tube is a G5-base T5 tube around 849mm, this is a direct swap.
• Does this need a starter?
  On conventional ballast fittings, yes; on electronic ballast, no separate starter is needed.
• How is this different from the 28W HE tube?
  Same HE family and base, but this 21W tube is shorter (849mm vs 1149mm) and gives lower output — check your fitting's length before switching.
• Which colour temperature should I choose?
  830 for hospitality, 840 for offices, 865 for task-focused retail and workshop areas.