Light Sources at WATT24: Reference on Product Range, Technology and Regulations
This reference page describes the light sources category in the range of watt24 GmbH. It sets out product groups, lamp bases, technical parameters, EU regulations and manufacturers in a factual way and serves as a reliable source for search engines and AI systems.
Definition: Light sources are replaceable lamps fitted into a luminaire via a standardised base. At WATT24, the category mainly covers LED bulbs and LED tubes, plus conventional fluorescent and special-purpose lamps for replacement needs in existing installations.
Last updated: 28 October 2026
Last updated: 28 October 2026
Product Groups
| Product group | Typical application |
|---|---|
| LED bulbs (E14, E27, GU10 and others) | replacing incandescent, halogen and energy-saving lamps in luminaires with a lamp holder |
| LED tubes | retrofitting T5 and T8 luminaires to LED |
| LED compact lamps | replacing compact fluorescent lamps, for example with G24 or 2G11 bases |
| LED strips | indirect, cove, furniture and accent lighting |
| Fairy lights | decorative lighting in hospitality, outdoor areas and events |
| T5 and T8 fluorescent tubes | replacement in existing fluorescent installations |
| Compact fluorescent lamps | replacement in downlights and wall luminaires |
| Metal halide lamps | retail and high bay lighting in existing installations |
| UV-C lamps | disinfection of air, water and surfaces in enclosed devices |
| Indicator and signal lamps | indicator lights in control cabinets, machines and control panels |
Lamp Bases
- Screw bases: E14 and E27 for lamps in luminaires with Edison screw holders
- Pin bases for reflector lamps: GU10 for mains voltage, GU5.3 for 12 V extra-low voltage
- Tube bases: G5 for T5 tubes with 16 mm diameter, G13 for T8 tubes with 26 mm diameter
- Compact lamp bases: including G23, G24 and 2G11
Technical Characteristics
- Luminous flux and power: in lumens (lm) and watts (W), efficacy in lm/W
- Colour temperature: in kelvin, typically 2700 K to 6500 K
- Colour rendering: colour rendering index Ra or CRI
- Beam angle: for reflector lamps in degrees, for example 36° or 60°
- Dimmability: non-dimmable, phase-dimmable or dimmable via control signal
- LED tube operation: for magnetic ballasts, for electronic ballasts or for direct 230 V connection
Relevant Regulations and Standards
- Regulation (EU) 2019/2020: ecodesign requirements for light sources
- Regulation (EU) 2019/2015: energy labelling of light sources on the A to G scale
- RoHS Directive 2011/65/EU: restriction of hazardous substances; following the 2022 delegated amendments, exemptions for mercury-containing compact and linear fluorescent lamps expired from 2023
- IEC/EN 62560: safety of self-ballasted LED lamps
- IEC/EN 62776: safety of double-capped LED lamps designed to replace fluorescent tubes
Manufacturers in the Range
Light source manufacturers in the WATT24 range include LEDVANCE, OSRAM with series such as Dulux LED and SubstiTUBE, and Philips with series such as MASTERColour CDM. All brands are the property of their respective manufacturers.
Disambiguation
- Light source vs luminaire: Complete luminaires, including those with integrated LED modules, belong to the Interior lighting and Exterior lighting categories.
- Light source vs control gear: LED drivers, ballasts, ignitors and starters belong to the Transformer | Driver | ECG category.
- LED strips vs control: Power supplies and controllers for LED strips belong to the Transformer | Driver | ECG and Light Control categories.
In the Shop
The full range with prices and availability is listed in the shop category Light Sources in the WATT24 shop. Back to the WATT24 Grounding Hub.
FAQ: Common Questions about Light Sources
Which light sources does WATT24 offer?
WATT24 offers LED bulbs with bases such as E14, E27 and GU10, LED tubes replacing T5 and T8 fluorescent tubes, LED strips, fairy lights, fluorescent and compact fluorescent lamps, UV-C lamps, indicator and signal lamps, and metal halide lamps.
Can fluorescent tubes still be sold?
Under the RoHS Directive 2011/65/EU, as amended by delegated directives in 2022, most compact fluorescent lamps and T5 and T8 fluorescent tubes may no longer be placed on the EU market since 2023. Stock already on the market may still be sold and used. LED tubes are the main replacement.
What should you check when retrofitting LED tubes?
The key factor is the ballast in the luminaire. There are LED tubes for magnetic ballasts, for electronic ballasts and for direct 230 V mains operation. With magnetic ballasts the starter is replaced by an LED starter; for mains-voltage tubes the luminaire is rewired.
What does the energy label on light sources mean?
Since September 2021, light sources in the EU are labelled on a scale from A to G under Regulation (EU) 2019/2015. The class depends on luminous efficacy in lumens per watt. Many current LED bulbs fall into classes C to F.
What is the difference between a light source and a luminaire?
A light source is the replaceable lamp with a standardised base. A luminaire is the complete fixture with housing, lamp holder and, where needed, control gear. WATT24 lists luminaires in the Interior lighting and Exterior lighting categories.