LED DownlightsRecessed
WAC MT-4LD216N-*30-** LED Downlight Manual
Setup, everyday use, maintenance and troubleshooting for the 10 in. recessed LED downlight, with verified specifications.
- Light output2,700 lumens
- Power30 W
- Efficacy90 lm/W
- Color temp.3000K
About the WAC MT-4LD216N-*30-**
The WAC MT-4LD216N-*30-** is a 10 in. recessed LED downlight certified under the ENERGY STAR program for light fixtures. It produces 2,700 lumens from 30 W of input power, an efficacy of 90 lumens per watt. That efficacy is better than 66% of the 3,089 Recessed models in our database.
Light quality: the fixture offers a 3000K color temperature (warm white) and a color rendering index of 82.
Notable features include continuous dimming. The rated light-source life is 46,600 hours.
Specifications
| Brand | WAC |
|---|---|
| Model number | MT-4LD216N-*30-** |
| Fixture type | Recessed |
| Nominal size / aperture | 10 in. |
| Light output | 2,700 lumens |
| Input power | 30.0 W |
| Efficacy | 90.0 lm/W |
| Color temperature(s) | 3000K |
| Color rendering index (CRI) | 82 |
| Rated light-source life | 46,600 hours |
| Power factor | 0.85 |
| Continuously dimmable | Yes |
| Indoor / outdoor use | Indoor |
| Insulation contact rating | Non-IC |
| Airtight rated | No |
| Tunable / selectable white | No |
| Full-color tunable | No |
| Selectable light output | No |
| Occupancy sensor | No |
| Connected (smart) capable | No |
Safety information
- Turn off power at the circuit breaker — not just the wall switch — before installing, removing or servicing the fixture, and confirm the circuit is dead with a non-contact voltage tester.
- Installation must comply with the National Electrical Code (NEC) or Canadian Electrical Code (CEC) and local codes. Many jurisdictions require a licensed electrician and a permit for new fixture locations or new wiring; if you are not comfortable with household wiring, hire one.
- Use only the junction box, housing, or mounting hardware specified in the installation instructions, and do not exceed the box-fill limits of the junction box.
- Install the fixture only on a circuit whose voltage matches the label, and never modify the LED driver or module.
- Connect dimmable fixtures only to dimmers the manufacturer lists as compatible, and keep the total connected LED load within the dimmer's LED rating (often much lower than its incandescent rating).
Installation and first-time setup
Recessed downlights mount above the ceiling, either in a new-construction housing fixed to joists before the drywall goes up or in a remodel housing that clips into a cutout in an existing ceiling. This model is a 10 in. fixture; use the cutout template from the manufacturer — never estimate the hole size.
- Plan the layout
Check for joists, ducts and pipes before cutting. As a starting point for general lighting, space fixtures about as far apart as the ceiling is high, and keep them about half that distance from walls; use closer spacing or more lumens for task areas.
- Turn off power
Switch off the breaker feeding the circuit and verify it is dead.
- Cut the opening
Trace the template and cut the opening with a drywall saw or hole saw. Keep the cut clean so the trim covers it fully.
- Wire the junction box
Feed the supply cable into the fixture's junction box through a cable clamp. Connect line to line, neutral to neutral and ground to ground with listed connectors, and close the box cover.
- Set options
Check any selectors on the driver before the fixture goes into the ceiling.
- Install the fixture
Push the housing or canless module into the opening until the mounting clips or springs grip the drywall and the trim sits flush.
- Restore power and test
Turn on the breaker and check operation through the full dimming range.
Using your downlight
Dimming
The fixture dims continuously. Check the manufacturer's compatibility list: most LED drivers work best with trailing-edge (ELV) or LED-rated dimmers, and some dimmers have a low-end trim adjustment that stops flicker at the bottom of the range.
Light output and placement
At 2,700 lumens, this is a high-output fixture suited to tall ceilings, lobbies, retail and other commercial spaces. LED fixtures reach full brightness instantly and are not shortened by frequent switching.
Care and maintenance
| When | What to do |
|---|---|
| Every 3–6 months | Dust the trim and lens with a soft, dry microfiber cloth with the light off and cool. Do not spray cleaner directly onto the fixture. |
| Every year | Check that the trim still sits flush and the springs or clips hold it firmly. A sagging trim can leave a gap that lets attic air leak. |
| When cleaning greasy kitchens | Wipe the lens with a cloth dampened in mild soapy water, then dry it. Avoid solvents and abrasive pads, which can cloud the lens. |
The integrated LEDs are not user-replaceable bulbs. The rated light-source life of 46,600 hours works out to roughly 43 years at 3 hours a day, or about 11 years at 12 hours a day. Over time the LEDs gradually dim rather than burning out; when output becomes too low, or if the driver fails, replace the fixture or LED module as the manufacturer directs.
Troubleshooting
Most downlight problems trace back to dimmer compatibility or wiring connections. Always turn off the breaker before opening the fixture or the junction box.
| Problem | Possible cause | What to try |
|---|---|---|
| Light does not turn on | Breaker off or tripped; loose wire connection; switch or dimmer failure. | Check the breaker; with power off, confirm connections in the junction box are tight; test with a standard switch. |
| Flickers or buzzes when dimmed | Dimmer not compatible with the LED driver; dimmer low-end trim set too low; too many or too few fixtures on the dimmer. | Use a dimmer on the manufacturer's compatibility list; adjust the dimmer's low-end trim; keep the load within the dimmer's LED rating. |
| Faint glow when switched off | Illuminated or smart switch leaking a small current; shared neutral wiring issue. | Try a standard switch; use a smart switch that has a neutral connection; have an electrician check the wiring. |
| Does not dim smoothly or turns off at low settings | Dimmer range not matched to the driver. | Raise the dimmer's minimum setting; consult the dimmer and fixture compatibility notes. |
| Color looks different from the other fixtures | Fixture has a different color temperature from neighboring fixtures. | Use fixtures with the same color temperature (this model is 3000K). |
| Trim falls or hangs below the ceiling | Springs or clips not engaged; opening cut too large. | Reseat the springs in the receivers; use a trim with a wider flange or repair the drywall. |
| Turns off by itself after running a while | Driver overheating, often from insulation packed around a fixture or a loose connection. | Turn off power and check the installation. Do not cover Non-IC fixtures with insulation; call an electrician if the problem continues. |
Energy use and running costs
The WAC MT-4LD216N-*30-** draws 30 W. Used 3 hours a day — a typical home assumption — it consumes about 32.9 kWh a year, roughly $5.58 per year at an electricity price of $0.17 per kWh. In a commercial space lit 12 hours a day, the same fixture uses about 131 kWh, or $22.34 a year.
Efficacy — lumens of light per watt of electricity — is the best single measure of a fixture's efficiency. This model delivers 90 lm/W. That figure is better than 66% of the 3,089 Recessed models in our database.
| Daily use | Energy per year | Cost per year |
|---|---|---|
| 1 hour | 11.0 kWh | $1.86 |
| 3 hours | 32.9 kWh | $5.58 |
| 6 hours | 65.7 kWh | $11.17 |
| 12 hours | 131.4 kWh | $22.34 |
The listed power factor is 0.85.
Dimming reduces power roughly in proportion to light output.
Frequently asked questions
How bright is the WAC MT-4LD216N-*30-**?
It is rated at 2,700 lumens while drawing 30 W, for an efficacy of 90 lumens per watt.
Is the WAC MT-4LD216N-*30-** dimmable?
Yes. It is continuously dimmable. Use a dimmer the manufacturer lists as compatible for flicker-free operation.
What color temperature is the WAC MT-4LD216N-*30-**?
It is a 3000K fixture with a CRI of 82.
What size is the WAC MT-4LD216N-*30-**?
Its nominal size is 10 in. Confirm the exact cutout or housing dimensions in the manufacturer's installation sheet before purchasing.
Can the WAC MT-4LD216N-*30-** touch insulation?
No. It is Non-IC rated, so insulation must be kept at least 3 in. away from the fixture.
How much does it cost to run the WAC MT-4LD216N-*30-**?
At 3 hours a day and $0.17/kWh, it costs about $5.58 a year to operate.
Sources and disclaimer
Specifications on this page come from the ENERGY STAR certified led downlights dataset published by the U.S. Environmental Protection Agency (record certified February 19, 2025), retrieved October 7, 2026.
The setup, operating, maintenance and troubleshooting guidance is written by ManualHarbor's editors for this specific product type and configuration. It is an independent guide — not a reproduction of the manufacturer's manual — and ManualHarbor is not affiliated with WAC. Always follow the safety instructions, installation requirements and warranty terms supplied with your unit, and contact WAC or an authorized service provider for warranty repairs and replacement parts.
Running-cost figures use assumed U.S. average utility prices and are estimates for comparison only. See our editorial methodology for details.
Report a problem with this guide
Spotted a wrong value, a broken link or something unclear? Tell us and we will review it.