Tunable White LED Spot | 60° Ra90 2200-6500K 24V 4W+4W
Item Code: 81061M04 / Series: Expert
Tax included, Free Shipping (8-15days)
Tips:
TILLUME Expert 24V LED Spot
Tunable White LED Spot 24V 4W+4W, 2200–6500K for KNX and DALI
Compact 24V tunable white LED spot module with an MR16/GU10-like form factor for KNX, DALI, Loxone and other 24V PWM lighting systems.
For tunable white projects
Warm white from 2200K and daylight-like light up to 6500K in one compact 24V LED spot module.
For KNX, DALI and PWM
The final output matters: it must be planned as a suitable 24V PWM output for warm white and cool white channels.
MR16/GU10-like form factor
The aluminium body works as a heat sink and can be used in many suitable downlight frames or housings.
24V tunable white spot module with an MR16/GU10-like form factor
The TILLUME 24V tunable white LED spot is a compact spot module for 24V constant-voltage lighting systems. Its form factor follows common MR16/GU10 dimensions and can be installed in many suitable frames or housings.
Brightness and colour temperature can be controlled separately when the controller provides two suitable 24V PWM outputs for warm white and cool white.
Project note: Frames and housings from different manufacturers can have different tolerances and thermal space. For larger projects, test the planned frame or housing with a sample module before installation.
Technical data
Technical documentation opens in a new tab.
Planning data from the technical specification
This short summary covers the data that installers, KNX/DALI planners and smart home integrators should check before ordering. The full specification remains the reference for project approval.
Optics and light quality
2200–6500K tunable white, 60° beam angle, Ra >90 on the individual channels and up to Ra >95 with mixed control around 4000K.
Electrical planning
24V DC constant-voltage operation with two separate WW/CW channels at 4W+4W. The 8W total output is only relevant when the controller can drive both channels suitably.
PWM and dimming
Dimming is handled by the upstream 24V PWM output. For most projects, we recommend a PWM frequency of 1–4 kHz; TILLUME Expert spots can support up to 6 kHz when the controller and dimming behaviour are suitable.
Mechanical and wiring
50 mm length, 49 mm diameter and 150 mm connection cable. Before a larger installation, check the frame, thermal space, cable route and strain relief in the real build-up.
How to use the specification: For quantities, cable runs, voltage drop, controller output, PWM frequency and installation space, check the technical documentation together with the selected controller data sheet.
Which systems can this 24V tunable white LED spot be used with?
The spot is designed for 24V constant-voltage lighting circuits. The higher-level system may be KNX, DALI or Loxone. What matters is the final output to the LED module: it must match the power, channel count, PWM quality and required dimming curve.
KNX
Suitable with KNX LED controllers or KNX LED dimming actuators that provide matching 24V outputs for warm white and cool white.
DALI
Suitable with DALI DT8 tunable white controllers, or with two DALI DT6 channels when the project logic is planned accordingly.
Loxone / PWM
Suitable when two PWM channels are available for WW/CW and the load per channel stays within the controller limit.
MDT AKD-0424R setup with 4+4W tunable white LED spots
The 4+4W tunable white spot is a good fit for the MDT AKD-0424R when the ETS setup uses the max brightness behaviour for compact two-channel WW/CW lighting zones.
Up to around 8W total output is realistic only in the mid CCT range and with a suitable max brightness configuration. For a more even brightness impression across the CCT range, constant output brightness is usually the more stable planning logic.
Example: MDT KNX LED actuator for 24V outputs
MDT AKD-0424R KNX LED actuator
The MDT actuator provides the 24V output on the KNX side. In ETS, the designer defines whether the room should have more output in the mid CCT range or a more even brightness impression when changing colour temperature.
Max brightness mode · planning with 4+4W output
Warm white and cool white can be raised together in the mid CCT range. In this MDT mode, the 4+4W spot can therefore reach up to around 8W total output.
Constant output brightness · standard planning
Use constant output brightness when the room needs a more even brightness impression across the CCT range. Product selection then follows this more stable output target.
Once the lighting target and MDT ETS configuration are defined, product selection becomes clearer. Max brightness suits projects that need more available output in the mid CCT range. Constant output brightness suits rooms that should remain more evenly bright when colour temperature changes. In both cases, check WW/CW output, around 20% reserve, channel load and voltage drop.
How max power output works with a 4+4W tunable white module
In max-power-output mode, the MDT AKD-0424R can use the warm white and cool white channels more strongly at the same time in the mid CCT range. This allows a 4W+4W tunable white module to reach up to around 8W total output there. At the end points, one channel dominates: warm white at low CCT and cool white at high CCT.
Simplified illustration: the actual curve depends on ETS parameters, controller logic and project target.
Key point: The higher total output is not a fixed value across the whole CCT range. It requires suitable ETS configuration, enough channel reserve, a suitable 24V power supply and controlled voltage drop.
DALI operation with DT8 or DT6
With DALI DT8, colour temperature and brightness are controlled through a shared tunable white logic. Depending on the controller and its parameters, each channel may not behave like two independently driven full-power channels. If the full 8W total output is relevant for the project, check the controller output logic first.
| Controller type | Examples | Planning note |
|---|---|---|
| DALI power supply / controller DT8 | 89453849-CWW-24V | For tunable white logic with shared control. |
| DALI LED dimmer CV, DT8 | 89453836, 86458673, 89453838, 89453841, 89453841-HS | Check output power and behaviour in tunable white operation. |
| DALI 2-channel LED dimmer CV, DT6 | 89453827, 89453833, 86459561, 89453830, 89453840-HS | Useful when two channels should be planned separately. |
When is 8W total output possible?
The 4W+4W rating describes the two LED channels: warm white and cool white. Whether both channels can be driven at full power at the same time depends on the controller. For full 8W operation, the project needs independent channel control, enough output power, suitable parameters and a 24V power supply with sufficient reserve.
If a controller uses constant total output or a shared brightness curve in tunable white operation, the real total output may be lower. This is not a fault of the spot module; it is part of the controller logic.
Planning FAQs
Can this spot be used with the MDT AKD-0424R?
Yes, if the ETS parameters, WW/CW channels, output power, load reserve and voltage drop suit the project. The MDT actuator is one example of KNX-side 24V control.
When can up to 8W total output be reached?
Up to 8W is realistic when the warm white and cool white channels are suitably used together in the mid CCT range. This requires the right controller logic, channel reserve and 24V supply.
Is this a GU10 lamp?
No. It is a 24V LED spot module with an MR16/GU10-like form factor. It is powered by external 24V constant voltage and requires suitable PWM control.
DALI DT8 or DALI DT6: which is better?
DT8 is practical for shared tunable white logic. DT6 is useful when two channels should be planned separately. The important point is the output logic of the selected controller.
What does the Spectrum Test Report show?
The EVERFINE CAS-200 report documents measurements in low, mid and high CCT ranges for this 4+4W spot. It is a reference for optical details, not a simplified marketing claim.
What should be checked before ordering?
Check controller output, WW/CW channel mapping, power per channel, around 20% power supply reserve, cable length, voltage drop, PWM frequency and installation space.
Last updated: June 2026
Related products and planning resources
Spectrum Test Report for this 4+4W spot
The report covers measurement points in low, mid and high CCT ranges and supports optical detail checks for the project.
Since 2015
DTW development
Built around real KNX and DALI controller requirements.
Custom COB
Not off-the-shelf
Chip selection, phosphor and binning are specified for stable light quality.
Reflector optics
Cleaner mixed beam
Designed to reduce visible CCT separation in DTW applications.
System reliability
Driver + heat path
Electrical and thermal margins matter more than headline lifetime claims.
01 / Development
Development of Tunable White 24V LED Spots
TILLUME has been developing dim-to-warm LED lighting products since 2015. At that time, KNX and DALI tunable white controllers were still limited, and many controller platforms were originally built around single-CCT or DT6-style applications. Our early product development therefore focused on compatibility with the most common control methods available in real projects.
The challenge
Available dual-CCT COB options were limited. Some early market solutions offered only CRI 80, restricted customization and insufficient brightness for our target applications.
Our solution
We worked with partners to develop a two-CCT COB and designed a dedicated circuit for constant-voltage PWM signal input with a 3-wire connection.
Optical requirement
Because the light-emitting position changes during CCT adjustment, the optical system must mix light carefully to avoid visible colour separation.
02 / Construction
Key Components in a 24V LED Spot Module
A high-quality LED module is not the result of one single component. It depends on chip selection, COB packaging, driver design, optical design and heat dissipation working together as a system.
LED chips
The LED chip is the core of the COB. Chip quality affects brightness, colour accuracy, heat generation and service life. TILLUME places enough large-size chips within the limited COB area so each chip has more operating margin at the required current.
Larger chips can improve light efficiency and reduce heat stress, helping to limit colour shift and improve long-term stability.
COB packaging process
Instead of simply purchasing a common COB from the market, TILLUME cooperates directly with LED chip and LED packaging partners. The LED chips are fixed on a high-reflectivity aluminium substrate, connected with gold wire and covered with phosphor.
Every COB is tested for photoelectric performance to improve consistency in light colour and electrical behaviour. For higher reflective efficiency, we use high-reflectivity material from German manufacturer Alanod as part of the COB substrate solution.
High colour rendering is not only about a CRI number. We also care about the relationship to the Planckian locus and colour-quality behaviour that users can actually see in warm residential lighting.
03 / Electronics
Specialized Circuit Driver for 24V PWM Systems
Low-voltage installations may experience voltage drop along the cable. In simple LED products, changes in input voltage can cause changes in LED current, which may create visible brightness differences between modules installed at different distances.
TILLUME uses a dedicated constant-current optimized circuit inside the spot module. Within the intended voltage range and system conditions, this helps the module keep a more stable drive current and reduces visible brightness inconsistency.
04 / Thermal Design
Heat Dissipation: Why Real Lifetime Depends on Temperature
LED lifetime claims are often based on idealized test conditions. In real luminaires, the COB, bonding materials and internal driver circuit all operate at elevated temperatures. Better thermal design is therefore one of the most important factors for long-term reliability.
6063 aluminium
Selected for better thermal conductivity compared with lower-cost aluminium options often used in LED housings.
Larger heat path
The module body and fin structure are designed to increase contact area with surrounding air.
Driver heat transfer
Internal PCB and mechanical design help conduct heat away from electronic components.
Test condition shown above: 24V input, both channels at maximum power, operated until the temperature stabilized after approximately 20 minutes.
05 / Optical System
Lens or Reflector?
For dual-CCT COBs, a lens can easily amplify colour separation because the emitting position changes during CCT adjustment. A reflector-based system gives us more control over light mixing before the beam leaves the module.
Common lens risk
The centre and edge of the beam may show different colour temperatures, especially during dim-to-warm transitions.
TILLUME reflector approach
A mixing part and reflector system help blend different CCT directions before forming the final beam.
The metal reflector also avoids the yellowing risk associated with some plastic optical parts after long-term operation.
06 / Quality Control
Strict Quality Control Process
Incoming material control
Important materials are inspected with higher attention before entering production.
Colour consistency
COB and chip sorting are used to improve consistency between modules and batches.
Appearance standard
Mechanical details and surface finish are controlled to match the product positioning.
Aging test
Each lamp goes through an aging process to reduce the risk of early failure after shipment.
Built for serious 24V smart lighting projects
TILLUME DTW spots combine custom COB development, PWM-compatible electronics, reflector optics and thermal engineering for professional KNX, DALI and low-voltage lighting systems.
Explore TILLUME DTW Spots