DMF Lighting builds recessed downlights as a modular system rather than as finished fixtures. You buy a housing, a light module and a trim, and those three parts are ordered separately. That catches people out on their first DMF takeoff, because a single "downlight" on the schedule is three line items, and a missing trim means a hole in the ceiling on inspection day.
This guide covers what DMF actually publishes for each series, which series belongs on which job, and the ordering traps worth knowing before you release a purchase order. Rock stocks 122 DMF part numbers, and you can browse the full list on the DMF Lighting collection.
The modular system, and why it matters on a takeoff
Every DMF family separates into three orderable parts:
- Housing. New construction, remodel, surface mount or concrete, in the aperture size you need.
- Module. The light engine. Lumen output, colour temperature and dimming type live here.
- Trim. Round, square, flush, adjustable, flangeless and other geometries.
The practical consequence is that a design change late in the job is usually a trim swap or a module swap, not a demolition job. DMF states that the M Series Commercial module range is a quick-connect change from fixed to adjustable, and that the X Series housing drops its splice to the ceiling plane on a service plate so the driver stays reachable from below.
The consequence for ordering is less pleasant. If you price a DMF job off a fixture count, you will underbuy. Count housings, modules and trims separately.
H Series: the 3 inch and 4 inch residential workhorse
The H Series is DMF's value line for whole-home work. Per DMF's H Series page:
| Spec | Published value |
|---|---|
| Aperture | 3 inch and 4 inch |
| Lumens | 350 lm (5W), 750 lm (9W), 950 lm (12W) |
| Colour quality | 90+ CRI, 3-step SDCM |
| Colour temperature | 2700K, 3000K, Natural Warm Dim 3000K to 2200K |
| Dimming | TRIAC/ELV to 5% |
| Input | 120V |
| Ratings | Energy Star, Title 24 JA8, Declare Listed, Wet Location, IC, NSF/ANSI 2 |
| Options | Fire Rated, Plenum Rated |
Two things are worth flagging. First, the module carries a field-selectable brightness switch, so one part number covers 350, 750 and 950 lumens. That is genuinely useful for stocking, because you are not committing to an output at the order stage. Rock carries the HM30 (90+ CRI, 3000K, 350/750/950 lm brightness switch), the HM27 (2700K) and the HM3C warm dim module.
Second, DMF's own page carries an inconsistency on warm dim. The headline spec block lists Natural Warm Dim as 3000K to 2200K, while the overview section further down the same page lists "3000K-2200K & 2700K-1800K". The 2700K to 1800K variant corresponds to the older HM2C module, which is discontinued and archived in Rock's catalogue. Spec from the module part number, not from the series bullet.
The H Series is 120V only and TRIAC/ELV only. If the job needs 277V or 0-10V, this is the wrong series, and that is the single most common H Series mis-spec.
M Series Commercial: the 4 inch spec-grade option
This is the series to reach for when the job has a lighting designer, a ceiling above 12 feet, or a control system. Per DMF's M Series Commercial page:
| Spec | Published value |
|---|---|
| Aperture | 4 inch |
| Lumens | 750 lm (9.5W), 1000 lm (12.5W), 1250 lm (14.3W), 1500 lm (14.3W), 2000 lm (24.5W), 2500 lm (27.5W), 3000 lm (34.0W), 3500 lm (40.5W) |
| Colour quality | 93 CRI, 2-step SDCM |
| Colour temperature | 2400K, 2700K, 3000K, 3500K, 4000K, Warm Dim, Tunable White |
| Beam spread | 15° narrow spot, 25° spot, 40° flood, 60° wide flood, 90° general ambient |
| Dimming | 0-10V to 1%, DALI-2 to 0.1% |
| Input | 120/277V |
| Warranty | 5 year, 50,000 hours |
| Ratings | Energy Star, Declare Listed, RoHS, Wet Location, NSF/ANSI 2 splash zone, IP66, IK10, anti-microbial |
Note what changes against the H Series. The dimming protocol becomes 0-10V and DALI-2, the input becomes 120/277V, and beam spread becomes a specifiable option rather than a fixed general-ambient distribution. If you are integrating downlights into a commercial control system, those three lines are the reason to pay the difference. Our guide to 0-10V dimming covers why the control protocol usually decides the fixture, rather than the other way round.
The 1250 lm and 1500 lm packages are both published at 14.3W. That is not a typo on our side; DMF lists them that way, which implies a driver-level output setting rather than two different engines. Confirm the ordering code with your rep if the difference matters to a Title 24 calculation.
One more DMF-side inconsistency: the headline block says 93 CRI, while the overview section on the same page says "90+ CRI". Use 93 CRI only if your spec sheet for the specific module says 93.
X Series: 2 inch aperture, full spec flexibility
The X Series is the small-aperture line, and on paper it is the most capable of the three:
- Lumens, downlight: 500 lm (9.5W), 750 lm (9.5W), 1000 lm (12.5W), 1250 lm (14.3W), 1500 lm (14.3W)
- Lumens, adjustable: 500 lm (9.5W), 750 lm (9.5W), 1000 lm (12.5W)
- Colour quality: 93 CRI, 2-step SDCM
- Colour temperature: 2400K, 2700K, 3000K, 3500K, 4000K, Warm Dim, Tunable White, Turtle Friendly
- Beam spread: 10° ultra narrow spot, 20° narrow spot, 30° spot, 40° flood, 50° wide flood, 50° x 30° linear spread
- Dimming: 0-10V to 1%, TRIAC/ELV to 1%, DALI-2 to 0.1%
- Input: 120/277V
- Ratings: Energy Star, Title 24 JA8, Declare Listed, Wet Location, Chicago Plenum, IC
- Warranty: 5 year, 50,000 hours
The X Series is the only one of the three DMF lists with all three dimming protocols on the same series, and the only one listing Chicago Plenum. It also carries a Turtle Friendly option, which matters on coastal projects with wildlife lighting ordinances.
S Series and surface mount
DMF's S Series covers surface-mount downlights for ceilings with no plenum depth, including junction-box mounting. Rock stocks several fixed-output S Series units, for example the DRD5S4R10930T at 12W, 4 inch round, 3000K, 1,000 lumens, TRIAC/ELV, 120V, and the DRD5S4L15930 at 17W, 18 inch linear, 3000K, 1,500 lumens.
These are finished fixtures rather than modular assemblies, so they price and order like a normal luminaire. They are the right answer for concrete ceilings, closets and retrofit work where cutting a can is not an option.
Choosing between the series
| If the job needs | Specify |
|---|---|
| 120V residential, budget-sensitive, 3 or 4 inch | H Series |
| 277V or a 0-10V/DALI control system, 4 inch | M Series Commercial |
| 2 inch aperture, beam control, any dimming protocol | X Series |
| No plenum depth, surface or J-box mount | S Series |
| Chicago Plenum | X Series |
| IP66, IK10 or anti-microbial | M Series Commercial |
Fire rating, IC rating and plenum: read the housing, not the series
A recurring source of failed inspections is treating a rating as a property of the series. It is a property of the specific housing you ordered.
DMF publishes fire rating as an option on H Series, not as standard, and lists Chicago Plenum on the X Series but not on the H Series headline spec. IC rating likewise attaches to the housing. If your ceiling assembly is rated, the housing part number has to carry that rating explicitly, and you should have the housing spec sheet in the submittal package. Our guide to fire-rated downlights explains what a rated ceiling actually requires and why a rated trim does not substitute for a rated housing. Rock's fire-rated downlights collection lists the rated housings we stock across brands.
Title 24 and California jobs
DMF lists Title 24 JA8 compliance on the H Series and X Series headline specs. The M Series Commercial headline spec does not list JA8, which is consistent with it being a commercial line, since JA8 governs high-efficacy residential luminaires rather than commercial downlights.
If you are working residential in California, the JA8 listing is not optional and it is checked at inspection. Our explainer on JA8 high-efficacy lighting covers what the listing actually certifies. Note that JA8 has edition years, and a product certified to an older edition is not automatically certified to the current one; confirm the edition on the module's spec sheet before you submit.
Colour temperature and warm dim
DMF offers three distinct colour behaviours, and they are not interchangeable on a schedule:
- Dedicated CCT. A fixed 2700K, 3000K and upward. Predictable, and the right default for commercial work.
- Warm Dim. Colour temperature falls as you dim, mimicking an incandescent. DMF publishes 3000K to 2200K on the H Series.
- Tunable White. Colour temperature is set independently of output, on M Series Commercial and X Series.
Mixing dedicated CCT and warm dim modules in the same sightline will show. If you are deciding what colour temperature the space wants in the first place, our guide to choosing colour temperature for commercial spaces works through the decision by space type.
How DMF compares to the other recessed lines Rock stocks
DMF sits in the specification-grade tier. Against the two other recessed brands Rock carries in volume:
- Elco is broader and more price-driven, with the Koto modular system covering 2 inch through 6 inch. See our Elco recessed downlights buying guide.
- Nora overlaps DMF most closely on spec-grade small aperture work through the Iolite line, and offers more dimming protocol choice per housing. See our Nora Lighting buying guide.
DMF's distinguishing features are the below-ceiling serviceability, the Declare listing on every series, and the IP66/IK10/anti-microbial options on M Series Commercial for healthcare and food service.
Before you order
Reading the spec sheet properly is most of the job. Our guide to reading a lighting spec sheet covers which numbers actually decide a fixture. For DMF specifically, check these five before releasing the order:
- Housing, module and trim are all on the order, in matching quantities.
- The housing carries every rating the ceiling assembly requires, in writing.
- The dimming protocol on the module matches the control system.
- The input voltage matches the circuit, since H Series is 120V only.
- The colour temperature is consistent across every module in the same sightline.
If you would rather have this checked for you, send us the fixture schedule and we will build the DMF part numbers and flag anything that will not hold spec. Start a request for a quote, set up a contractor account for project pricing, or contact us with the drawings.
Related guides
- Elco Lighting Recessed Downlights: Koto, Oak and Pex Buying Guide
- Nora Lighting Buying Guide: Recessed Downlights, Fire-Rated Housings and Cylinders
- Fire-Rated Downlights: A Contractor's Guide to Rated Ceilings
- How to Read a Lighting Spec Sheet
- Choosing Color Temperature for Commercial Spaces
- What Is 0-10V Dimming?
Frequently asked questions
Is a DMF downlight sold as one part number or three? Three, for the modular series. The H Series, M Series Commercial and X Series each separate into a housing, a light module and a trim, and each is ordered separately. The S Series surface-mount units are finished fixtures and order as a single part number.
What is the difference between DMF H Series and M Series Commercial? H Series is a 3 inch and 4 inch residential line at 120V with TRIAC/ELV dimming and outputs of 350, 750 and 950 lumens. M Series Commercial is a 4 inch line at 120/277V with 0-10V and DALI-2 dimming and outputs from 750 to 3500 lumens, plus specifiable beam spreads. The control protocol and the voltage are usually what decides between them.
Which DMF series can dim on 0-10V? M Series Commercial (0-10V to 1%, DALI-2 to 0.1%) and X Series (0-10V to 1%, TRIAC/ELV to 1%, DALI-2 to 0.1%). The H Series is TRIAC/ELV only, to 5%, and cannot be used on a 0-10V control system.
Are DMF downlights Title 24 JA8 compliant? DMF lists Title 24 JA8 on the H Series and X Series headline specifications. JA8 has edition years, so confirm which edition the specific module is certified to on its spec sheet before submitting for a California residential permit.
Can DMF downlights go in a fire-rated ceiling? Only with a housing that carries the fire rating. DMF publishes fire rating as an option on the H Series rather than as standard, and the rating belongs to the housing part number, not to the series or the trim. Get the housing spec sheet into the submittal package.
What is DMF's warranty on recessed downlights? DMF publishes a 5 year limited warranty with a 50,000 hour figure on the M Series Commercial and X Series pages. The H Series page does not state a warranty term in its headline specification, so confirm it with your rep for that series.
Sources
- DMF Lighting, H Series, https://www.dmflighting.com/product/h-series/ (fetched 2026-08-24).
- DMF Lighting, M Series Commercial, https://www.dmflighting.com/product/m-series-commercial/ (fetched 2026-08-24).
- DMF Lighting, X Series, https://www.dmflighting.com/product/x-series/ (fetched 2026-08-24).
- Rock Lighting & Electric catalogue data, Shopify Admin, 2026-08-24.