| Energy Efficiency | Useful light output compared with electrical power consumption. | Approximately 80 lm/W or higher | A higher efficacy produces more light while using less electricity. | Check the lumens and watts listed on the product label or technical data sheet, then divide lumens by watts. |
| Standby Consumption | Power used when the light is switched off but remains connected to Wi-Fi, Bluetooth, or a hub. | Prefer a clearly stated low standby figure; lower is better | Smart lights can remain connected continuously, so standby use may affect long-term energy consumption. | Look for standby power information in the specification sheet or ask the manufacturer for a measured value. |
| Color Temperature | Whether the light can provide warm, neutral, or cool white light. | About 2,700–6,500 K for adjustable-white models | Warm light is generally comfortable for living areas, while cooler light can support task-oriented spaces. | Confirm the adjustable color-temperature range and whether the change is continuous or limited to preset steps. |
| Color Rendering | How accurately the light reveals the colors of furniture, artwork, food, and clothing. | CRI 80+ for general rooms; CRI 90+ for kitchens, dressing areas, and display spaces | Higher color-rendering performance usually gives objects a more natural appearance. | Check the stated CRI or Ra value. Treat claims without a published test method cautiously. |
| Dimming Performance | Brightness range, smoothness, minimum stable output, and flicker behavior. | Smooth dimming to approximately 10% or lower, without visible flicker | Reliable low-level dimming improves comfort and helps create suitable evening lighting. | Test the light at low brightness with a phone camera and observe whether it flickers, steps, or turns off unexpectedly. |
| Control Options | Available control methods, such as app, voice assistant, remote, wall switch, or automation platform. | App Physical switch Voice or hub option | Multiple control methods provide convenience while preserving usability if the internet or phone is unavailable. | Confirm which functions work locally and which require an account, cloud service, internet connection, or separate hub. |
| Local Operation | Whether basic lighting functions continue during an internet outage. | Manual on/off and last-state recovery should work without cloud access | Local control prevents a network problem from disabling essential room lighting. | Read the offline-operation section and check whether the product supports local Bluetooth, a local hub, or a conventional wall switch. |
| Automation | Schedules, scenes, occupancy responses, sunrise/sunset routines, and adaptive brightness. | Schedules and scenes with clear time-zone and failure behavior | Automation can reduce unnecessary operating time and improve comfort without requiring repeated manual adjustments. | Check whether routines run locally or in the cloud and whether they continue after a router, power, or service interruption. |
| Privacy | Data collection, account requirements, microphone access, location use, and third-party sharing. | No microphone or camera by default; minimal data collection and clear deletion controls | A downlight should not require unnecessary access to personal data for basic lighting functions. | Read the privacy policy and app permissions. Check whether voice features can be disabled and whether an account is mandatory. |
| Security | Software updates, encrypted communication, account protection, and network configuration. | Encrypted connections, automatic update support, and multi-factor authentication where available | Connected lighting is part of the home network and should receive protection against unauthorized access. | Look for a published security policy, update-support period, vulnerability-reporting process, and secure Wi-Fi setup. |
| Network Compatibility | Supported wireless bands and connection requirements. | Clearly stated compatibility with the home network; many products support 2.4 GHz Wi-Fi | Some smart lighting products cannot join a 5 GHz-only network and may need a compatible hub or phone connection. | Confirm supported Wi-Fi bands, Bluetooth requirements, hub compatibility, and whether setup requires temporary location permissions. |
| Installation Fit | Cutout diameter, ceiling depth, junction-box requirements, insulation contact, and bathroom suitability. | Exact fit for the existing cutout and installation conditions | A technically advanced light is unsuitable if it cannot be safely installed in the ceiling. | Compare the installation diagram with the ceiling opening, driver dimensions, insulation rating, and local electrical requirements. |
| Damp-Location Rating | Protection against moisture for bathrooms, kitchens, covered porches, or other humid areas. | Use only where the stated rating matches the location; wet locations require products specifically approved for them | Using a fixture in an unsuitable location can create safety, corrosion, and reliability problems. | Check the official IP or location rating and follow local electrical codes and installation instructions. |
| Lifespan and Warranty | Rated operating life, warranty duration, replacement policy, and availability of the control system. | A published life rating and warranty terms that cover both fixture and electronics | Integrated LEDs may be difficult to replace, so long-term support is important. | Review the warranty exclusions, expected operating hours, support contact, and whether the product still works if the cloud service ends. |
| Total Cost of Ownership | Purchase price, hub or subscription fees, electricity use, maintenance, and replacement cost. | Compare five-year ownership cost, not only the initial price | A low-cost light may become more expensive if it needs a hub, subscription, frequent replacement, or higher power consumption. | Estimate: purchase cost + accessories + subscriptions + electricity cost + likely replacement cost over the intended service period. |
