Choose controls around the building’s functions and maintenance arrangements. Protocol names describe different parts of a system, so compare the proposed architecture before comparing fixture prices.
Start with the control brief
Record the zones, dimming range, sensors, scenes, schedules, and reporting needed. Decide whether the lighting must connect to other building systems and who will manage changes.
DALI-2 and D4i
DALI-2 certification covers control devices and functions within the DALI system. D4i adds specifications useful for data-rich luminaires and associated devices. Check the exact certified product and supported features rather than relying on a general “DALI-ready” description.
Matter and KNX
Matter supports compatible connected devices across supported ecosystems. KNX is used for building automation across several services. Their network design, controllers, product support, and commissioning workflows differ; select against the project requirements.
Outdoor interfaces
For a replaceable sensor or communication node, check mechanical fit, electrical connections, available power, and control support. A socket’s appearance alone does not establish compatibility. Verify the luminaire and node as a pair.
Compare installed and supported cost
Include gateways, sensors, wiring, commissioning, licences, training, and spare devices. Ask what works without an internet connection and whether the owner can access the configuration.
Test before standardizing
Trial a representative room or lighting zone. Include power recovery, low-level dimming, device replacement, and the intended building integration. Keep the approved configuration with the purchase order.
Frequently Asked Questions
Is one protocol always the cheapest?
No. Equipment, existing wiring, building size, commissioning, and support all affect installed cost.
Does a protocol guarantee compliance?
No. Confirm the required functions and verify them in the installed design.