Driving Spotlights Right — Constant Current, DALI Precision

A spotlight is only as good as the driver behind it. COB chips and LED modules are current-sensitive: the wrong drive current means reduced chip life, colour inconsistency across a run of fixtures, and thermal creep that shortens the entire installation's lifespan. The Nucleo DALI constant current driver range delivers a precisely regulated, adjustable current output — set once to match your fixture specification and then controlled seamlessly over DALI from any compatible controller or BMS.

With full DALI DT6 (dimming) and DT8 (tunable white / RGBW) support, these drivers integrate into professional building automation systems without proprietary lock-in. Fanless convection cooling, auto-recovery protection, and a wide input voltage range make them suitable for residential and commercial installations across India.

🔶 Why Spotlights Need Constant Current — Not Constant Voltage

LED strips run on constant voltage (12V or 24V). COB chips and LED modules inside spotlights and downlights are different: they need a fixed current in milliamperes. Feed a COB chip a constant voltage and its current will drift with temperature — brightening and degrading the chip in the process. A constant current driver eliminates this drift, keeping every fixture in the installation at the same brightness and colour for its full rated life.

Constant Current vs Constant Voltage — At a Glance

Constant Voltage (CV)

Outputs a fixed voltage — 12V or 24V DC. Used with LED strips that control their own current per segment via onboard resistors. The strip must be matched to the voltage; the driver does not control current directly.

Constant Current (CC) — This Product

Outputs a fixed current in milliamperes; output voltage varies with the load. Required for COB chips, LED modules, spotlights and downlights — devices that must be driven at a precise current to maintain brightness, colour and rated life.

DALI DT6 vs DT8 — Choosing the Right Protocol

DT6
Single Channel · Dimming Only

Controls output brightness from 0% to 100% on a single current channel. One DALI address per unit. The standard choice for single-colour or single-white COB spotlights and downlights where dimming is the only control requirement.

  • Smooth 0–100% DALI brightness control
  • Single output channel
  • Works with any DALI controller
  • Compatible with all standard single-white COB fixtures
  • Supports group and scene addressing
DT8
Multi-Channel · Tunable White / RGBW

Extends DT6 dimming with colour temperature control. Drive warm white and cool white COB channels independently to shift from 2700K to 6500K — or control RGBW channels for full colour. Requires a DT8-compatible DALI controller.

  • Tunable white (CCT) or RGBW colour control
  • Brightness + colour temperature from one DALI bus
  • Human Centric Lighting (HCL) ready
  • Ideal for hospitality, offices, healthcare
  • Requires DT8-capable DALI controller

Adjustable Output Current — One Driver, Multiple Fixtures

Rather than stocking a separate driver SKU for each fixture type, the Nucleo DALI CC driver is configurable to match the rated current of your LED module. Typical selectable values cover the full residential and commercial spotlight range:

350 mA
Small COBs
low-wattage spots
500 mA
Compact
spotlights
700 mA
Standard
downlights
1050 mA
High-power
COB spots

Always match the driver's output current setting to the rated operating current stated in your fixture's LED module datasheet before installation. Operating a COB at the wrong current — even slightly above its rating — accelerates lumen depreciation and reduces rated life.

Specifying for a project? Nucleo's team can help you match driver current settings to your fixture list, specify the right DALI controller, and set up group addressing and scene programming for the installation. Share your fixture schedule and floor plan and we'll build the driver spec for you.

Key Features

🎛️
DALI DT6 & DT8
Full DALI protocol support. DT6 for single-channel dimming, DT8 for tunable white and RGBW colour control. Open protocol — no proprietary lock-in.
⚙️
Adjustable Output Current
Selectable 350 / 500 / 700 / 1050 mA output. One driver model covers a wide range of COB and LED module fixtures — simplifies stock and specification.
✨
Flicker-Free PWM Dimming
High-frequency PWM eliminates visible and physiological flicker at all dim levels. Safe for offices, hospitals, classrooms and retail under WELL and HCL standards.
⚡
Up to 25W Output
Covers the full residential and commercial spotlight wattage range — 5W to 25W COB fixtures and LED modules in spotlights, downlights and track fittings.
🛡️
Auto-Recovery Protections
Short circuit, overload, over-voltage and over-temperature protection with automatic recovery — no service call for protection trips in normal operation.
🌡️
Fanless Convection Cooling
No moving parts. Convection-cooled housing operates silently and reliably in ceiling voids and junction boxes. Rated −20°C to +50°C.
🔌
Wide Input Voltage
AC 100–240V, 50/60Hz — compatible with Indian mains supply including sites where voltage fluctuates across the permitted range.
🏗️
BMS Integration Ready
DALI integrates with KNX, Crestron, Lutron, AMX and Siemens Desigo CC via standard DALI gateways. Participate in occupancy, daylight and timed scenes.

Where DALI CC Drivers Are Specified

🏢
Commercial Offices
🏨
Hotels & Hospitality
🏥
Hospitals & Clinics
🛍️
Retail & Showrooms
🎓
Schools & Universities
🏛️
Museums & Galleries
🏠
High-End Residential
🍽️
Restaurants & F&B
🔬
Laboratories
🎭
Auditoriums

Compatible Nucleo Fixtures

Engineered for Nucleo's full COB spotlight and downlight range, and compatible with third-party LED modules within the selectable current range:

💡
COB Recessed Downlight
🔦
COB Spotlight
⭕
Oreo COB Spot
❄️
Cool COB Spot
🔁
In-Out Pipe COB
🔄
Novatilt 360° Spotlight
🛤️
Track Spotlights
🧩
Third-Party COB Modules

Technical Specifications

ParameterSpecification
Driver typeConstant Current (CC)
Max output powerUp to 25W
Output current350 mA / 500 mA / 700 mA / 1050 mA (selectable)
Input voltageAC 100–240V, 50/60Hz
DALI protocolDT6 (single-channel dimming) & DT8 (tunable white / RGBW)
Dimming range0–100% smooth, flicker-free
Dimming methodHigh-frequency PWM
Power factor> 0.90
IP ratingIP20 (indoor / dry location)
Operating temperature−20°C to +50°C
CoolingFanless convection
ProtectionsShort circuit, overload, over-voltage, over-temperature (auto-recovery)
Compatible fixturesCOB spotlights, recessed downlights, track lights, LED modules
BMS integrationVia standard DALI gateway (KNX, Crestron, Lutron, AMX, Siemens)
SupplyPan India

Frequently Asked Questions

What is the difference between a constant current and constant voltage LED driver?
A constant voltage driver outputs a fixed DC voltage — 12V or 24V — and is used with LED strips that regulate their own current per segment. A constant current driver outputs a fixed current in milliamperes and lets voltage vary with the load. LED modules, COB chips, spotlights and downlights are current-sensitive devices that require constant current drivers to maintain stable brightness and protect the chip from thermal runaway.
What is the difference between DALI DT6 and DALI DT8?
DALI DT6 controls a single output channel — brightness only — from 0% to 100%. It is used for single-colour or single-white spotlights and downlights. DALI DT8 adds colour control: for spotlights this typically means tunable white — independently driving warm and cool white LED channels to shift from 2700K to 6500K. DT8 also supports RGBW colour control. DT8 requires a DALI controller that supports the DT8 colour extension.
How do I select the right output current for my spotlight?
Check the LED module or COB chip datasheet for your spotlight fixture — it will list a rated forward current, typically 350mA, 500mA, 700mA or 1050mA. Select the matching output current on the driver using the DIP switch or resistor before installation. Running a COB module at the wrong current will reduce life and may void the fixture warranty. Contact Nucleo if you need help matching drivers to your fixture schedule.
Why does flicker-free dimming matter in occupied spaces?
Even flicker at frequencies above the threshold of conscious perception causes measurable eye strain, headaches and reduced concentration during prolonged exposure. This is particularly relevant in offices, hospitals, classrooms and retail. High-frequency PWM dimming operates well above this threshold at every dim level — from 1% to 100% — ensuring smooth, physiologically safe light in WELL-certified and Human Centric Lighting (HCL) environments.
How many DALI addresses does one driver use?
Each driver uses one DALI address on the bus. A standard DALI bus supports up to 64 individual addresses — meaning up to 64 spotlights or downlights can be individually addressed and controlled from one DALI controller. Drivers can also be assigned to groups for scene-based control without consuming additional addresses.
Can I integrate these drivers with a building management system (BMS)?
Yes. DALI is an open protocol that integrates with most modern BMS platforms — including KNX, Crestron, Lutron, AMX and Siemens Desigo CC — via standard DALI gateways. The driver responds to standard DALI commands, enabling occupancy-based, daylight-linked and timed scene control without proprietary lock-in.
Which Nucleo spotlights are compatible with this driver?
The Nucleo DALI CC driver is compatible with the full Nucleo COB spotlight and downlight range — including the COB Recessed Downlight, COB Spotlight, Oreo COB Spot, Cool COB Spot, In-Out Pipe COB Spot, and the Novatilt 360-degree adjustable surface spotlight. It is also compatible with any third-party LED module or COB fixture rated within the 350–1050mA selectable current range.