Ketra by Lutron
Ketra tunable lighting, where it is worth it and how it goes in.
Light that shifts from cool daylight to warm evening from the same fixture, installed with Lutron HomeWorks.
CA Lic. #949580 Office in Newbury Park Mon to Fri, 9 to 5
Ketra is Lutron's tunable light source: lamps, downlights and linear fixtures that change color temperature and brightness through the day. County Line Electric, a Lutron dealer and licensed electrical contractor, specifies Ketra room by room and installs it as part of a Lutron HomeWorks system.
What Ketra is
One fixture, every color of white.
An ordinary LED fixture has one color temperature, chosen when it is bought. A Ketra source mixes color to produce natural white light that Lutron states runs from 1,400K to 10,000K, plus what Lutron calls a high-definition palette of 16.7 million colors. The same downlight can read like crisp daylight at noon and like candlelight late in the evening.
Lutron says Ketra emulates sunlight, gradually shifting in color and brightness so people feel more connected to the outdoors. Two features matter to a homeowner. Vibrancy, which Lutron calls a third dial of control, changes how light renders colors without changing the light's color itself. Color Lock monitors light output 360 times per second so that fixtures stay matched to each other.
Where it earns its place
The rooms where Ketra makes the most difference.
Kitchen and family room
The rooms used from early morning to late night, where a cool, bright start and a warm, dim evening are both real needs.
Primary bedroom and bath
Warm, low light at night without a separate set of fixtures, and bright, neutral light for the mirror in the morning.
Art and finishes
Where color rendering matters: art walls, stone, wood and fabric that a designer chose under a specific light.
Not every room needs Ketra. A garage, a laundry or a closet is better served by good fixed-color LED. County Line specifies Ketra where the change through the day is something the household will notice. Image courtesy of Lutron. County Line Electric is a Lutron dealer.
A day with Ketra
How Ketra changes a room from morning to night.
In a Ketra kitchen the morning scene is bright and cool, close to daylight, for making breakfast and reading the news. Through the afternoon the light follows the day, and as evening comes the same downlights warm and dim toward the color of a lamp or a candle, without anyone touching a keypad. The schedule is set once, with the household, and adjusted after a few weeks of living with it.
The difference people notice first is not a feature, it is the absence of a mismatch. Ordinary LED fixtures bought at different times drift apart in color, and a room ends up with three slightly different whites. Lutron's Color Lock is designed to prevent that, so the downlights, the lamps and the linear fixtures in a Ketra room read as one light.
The product types
What Ketra comes in.
Ketra comes in four product types: new construction downlights, remodel downlights, lamps and track, and linear fixtures.
| Type | Lutron products | Best for |
|---|---|---|
| New construction downlights | D2 New Construction, D3 New Construction | Open ceilings. Lutron says the D2 installs to the frame during rough-in |
| Remodel downlights | D2 Remodeler, D4R Remodeler, S30 Retrofit Downlight Trim | Finished ceilings |
| Lamps and track | A20, S30 and S38 lamps (E26 or GU24 base), S30 and S38 track | Lamps, pendants and track heads |
| Linear | G2 Linear, LS0 Lightbar Slim | Coves, shelves, under-cabinet and accent |
Product names from Lutron's Ketra page, November 2026.
How it goes in
Installing Ketra on a HomeWorks project.
- 01
Specify
Which rooms, which fixtures, and the beam and trim for each. Ketra goes on the fixture schedule with the rest of the lighting.
- 02
Rough-in
New construction downlights set to the frame, with power to each. Lutron notes each Ketra source has its own individually addressable wireless control, which removes the need for control wire and closet panels for those fixtures.
- 03
Processor
Lutron's HomeWorks QSX processor specification states the QSX processor is required when using the Clear Connect Type X gateway for residential Ketra sources. County Line plans the processor and gateway locations with the network.
- 04
Program
The color temperature and brightness for each scene and time of day, set with the household and adjusted once they have lived with it.
Is it worth it
When Ketra is the right call, and when it is not.
Ketra is worth it in rooms used across the whole day, in homes where a designer has chosen finishes under a specific light, and where the household wants evenings that feel like evenings. It is a HomeWorks product, so it makes the most sense in a house that already has, or is getting, a HomeWorks system.
It is not worth it as a scattering of fixtures in rooms nobody spends time in, or in a house that will stay on a simpler Lutron system. County Line will say so in the proposal. A mixed plan, with Ketra in the primary rooms and quality fixed-color LED everywhere else, is often the best answer.
What drives the cost
What a Ketra line item depends on.
A Ketra line item depends on how many Ketra sources the house gets, what kind they are, and the HomeWorks system behind them.
- The number of Ketra sources, and their types: downlights, lamps, track or linear
- New construction housings or remodel and retrofit trims
- Whether a HomeWorks system with a QSX processor is already in place
- Gateway placement and the network work behind it
- Programming time for daily schedules and scenes
County Line Electric at a glance
- 20+ yrsIn businessJeff Tucker has run County Line Electric in the Conejo Valley for over 20 years.
- #949580California contractor licenseLicensed, bonded and insured. Check it on the CSLB site any time.
- Site reviewSystem planningWiring, rooms and compatible controls reviewed for the project.
- A+BBB Accredited since 2017Rated A+ by the Better Business Bureau. See the profile.
- 5.0HomeAdvisor ratingFive stars from every reviewed job. Read the reviews.
Ketra questions
What is Ketra lighting?
Ketra is Lutron's tunable light source. Lutron states it produces natural white light from 1,400K to 10,000K and 16.7 million colors, and shifts color and brightness through the day. It comes as downlights, lamps, track and linear fixtures.
Does Ketra need Lutron HomeWorks?
For homes, Lutron lists Ketra under HomeWorks among its residential systems, and its HomeWorks QSX processor specification states the QSX processor is required when using the Clear Connect Type X gateway for residential Ketra sources.
Can Ketra go into an existing house?
Yes. Lutron makes Ketra remodel downlights for finished ceilings, a retrofit downlight trim, and lamps with standard E26 and GU24 bases. County Line reviews the ceilings and the existing system before proposing which products fit.
Is Ketra the same as smart bulbs?
No. Ketra is a professional Lutron product line with features such as Color Lock, which Lutron says monitors light output 360 times per second, and Vibrancy control. It is designed to work natively with Lutron's connected control systems.
How much does Ketra cost?
It depends on the number and type of Ketra sources, new construction or remodel products, the HomeWorks system and processor, and programming. County Line includes Ketra as itemized lines in a written proposal.
The Lutron library
Every Lutron system page.
Official references
Where the facts on this page come from.
County Line links to the authorities rather than restating them. Rules change; these pages are current.
- Ketra by Lutron: color range, Vibrancy, Color Lock, products
- Lutron HomeWorks QSX processor specification: Ketra gateway requirement
- Lutron residential systems: Ketra under HomeWorks
- Lutron HomeWorks: whole-home control
- CSLB license check: license #949580
Next step
Tell us which rooms matter most.
New construction or remodel, the rooms you live in most, and whether a designer has a lighting plan. The office sets up a consultation.
Or call (805) 499-0823. Monday to Friday, 9 to 5.