Light that changes how your home feels.
Most people never think about the quality of light in their home - until they experience Ketra. Then they can't imagine living without it.
16.7 Million colors available from a single light source
1,400K-10,000K Color temperature range - candlelight to arctic sky
70+ Patents protecting Ketra's light engine technology
What is Lutron Ketra?
Ketra is Lutron's pinnacle lighting technology - a full-spectrum, tunable light source that does something no standard LED can: it behaves like the sun. Instead of emitting a fixed color of white light, Ketra's proprietary four-channel engine continuously mixes color to produce light that spans from 1,400K - the warm, amber glow of candlelight - all the way to 10,000K, the crisp, brilliant blue-white of an arctic sky. Throughout the day, Ketra shifts gradually and automatically, mirroring the natural arc of daylight so your home always feels right for the moment - energizing in the morning, focused at midday, warm and relaxing by evening. The result is not just beautiful. It is a fundamentally different experience of being inside your home.
How Ketra transforms the feel of your home
Lighting is the single most underestimated element of interior design. The same room, with the same furniture and finishes, can feel completely different depending on the quality and color of its light. Ketra gives you control over that experience at a level that was previously impossible.
Morning. Cool, bright light eases you into the day - energizing and clear, like stepping outside on a crisp morning. Your kitchen, gym, or office comes alive without a single switch being touched.
Afternoon. Balanced, neutral tones support focus and productivity. Your home office, library, or studio feels purposeful and calm.
Evening. As the sun sets, Ketra shifts to warm, amber tones that prepare your mind and body for rest - the way firelight or candlelight has done for thousands of years. Dinner feels intimate. Your living room feels like a retreat.
Art & interiors. Ketra's Vibrancy control - a first-of-its-kind feature - allows you to adjust how light renders color without changing its temperature. Your paintings, sculptures, and architectural details are revealed in a way no standard LED can achieve.
Night. Ketra dims to as low as 0.1% - virtually invisible - while maintaining the warm glow of a sunset rather than the flat fade of a conventional dimmer. Your home never feels harshly lit, at any hour.
Light that works with your body, not against it
Your body's circadian rhythm - its internal 24-hour clock - is governed primarily by light. When the light in your home is static, artificial, and disconnected from the sun's natural cycle, that clock drifts. The result is disrupted sleep, reduced energy, and a subtle but persistent sense that something feels off.
Ketra corrects this. By gradually shifting in color and intensity throughout the day - automatically, invisibly, without any intervention - Ketra keeps your body synchronized with nature's schedule even when you never step outside.
Better sleep. Ketra's warm evening light supports natural melatonin production, signaling your body that it's time to wind down - leading to deeper, more restorative sleep.
Sharper focus. Cooler daytime tones promote alertness and concentration - the same quality of light that makes you feel more awake on a bright morning.
Improved mood & wellbeing. Exposure to natural-spectrum light throughout the day has been shown to improve mood, reduce fatigue, and support hormonal balance.
Reduced eye strain. Ketra's smooth, flicker-free light and adjustable color temperature eliminates the visual fatigue caused by harsh, static overhead lighting — particularly during extended reading or screen time.
Wellness at home is no longer limited to air purifiers and fitness rooms. The quality of your light matters just as much.
The technology behind Ketra
Four-channel light engine. Unlike standard LEDs that use a single white channel, Ketra mixes red, green, blue, and white light simultaneously - producing a far richer, more natural quality of white light that renders colors and surfaces the way natural sunlight does.
Color Lock. Ketra monitors light output 360 times per second, automatically compensating to maintain perfectly consistent color throughout the lifetime of every fixture. The light on day one is the light on day ten thousand.
Vibrancy. A unique third dimension of control that adjusts the spectral recipe of white light - revealing hidden depth in colors, textures, and artwork without changing the color temperature itself.
Wireless & individually addressable. Every Ketra fixture is independently controllable via wireless - no control wire, no closet panels, no rewiring required to rezone or redesign your lighting layout.
Seamless Lutron integration. Ketra integrates natively with Lutron HomeWorks and other Lutron control systems - the same platform controlling your shades, scenes, and whole-home automation through a single, elegant interface.
How Ketra Compares to Rania and Lumaris
Ketra is the pinnacle of Lutron's intelligent lighting portfolio - but it's not the only option. Lutron now offers three tiers of architectural light, each designed for different rooms, different budgets, and different levels of ambition. All three work within the same HomeWorks ecosystem and respond to the same scenes and keypads.
Ketra (1,400K–10,000K) - Full-spectrum color, 16.7 million colors, Vibrancy control, and Color Lock lifetime accuracy. The definitive choice for living rooms, dining rooms, master bedrooms, art galleries, and any room where the quality of light is non-negotiable. Available as downlights and lamps. Works with HomeWorks only.
Rania (1,800K–5,500K) - Exceptional natural white light built on Ketra's color science, with 90+ CRI and a broad tunable white range. Approximately 80% of Ketra's white light quality at a meaningfully lower investment. Available as downlights, lamps, and tape light. Works with HomeWorks.
Lumaris (1,800K–4,000K) - Lutron's accessible intelligent light. Tunable white with warm dim, 90+ CRI, plus a full RGB + tunable white tape light option with 16.7 million colors. Available as tape light and recessed downlights. Works with both RadioRA 3 and HomeWorks.
Many of the homes we design use all three - Ketra where the light quality matters most, Rania in the supporting spaces, and Lumaris tape light handling the accent layers throughout. They all live on the same system and work together seamlessly. During your consultation, we'll help you determine the right mix for your home.
Ketra Designed, Installed & Calibrated by Seattle's Certified Lutron Dealer
Ketra is not a product you buy off a shelf. Its full potential is realized only through expert design - the precise placement of fixtures, the tuning of scenes to your daily rhythms, the integration with your shades and automation systems so the light in your home moves in perfect harmony throughout the day. This is the most advanced residential light source in the world, and it demands the most experienced hands to install it.
As a certified Lutron dealer with over 20 years of experience, VIP Smart Homes designs, programs, and installs Ketra systems for luxury residences across Seattle, Bellevue, Medina, Mercer Island, and worldwide. Here's what our Ketra service includes:
Lighting Design - We work with your architect, interior designer, or directly with you to determine where Ketra belongs in your home. Not every room needs Ketra - but the rooms that do will never look the same. We specify fixture type, placement, beam angle, and scene design for every Ketra zone.
Fixture Selection - Ketra is available as D2 new construction downlights (2-inch aperture), D3 new construction downlights (3-inch aperture), D2 remodeler downlights for finished ceilings, A20 lamps, S30 and S38 PAR lamps, and linear fixtures. We select the right form factor for each room based on ceiling conditions, output requirements, architectural style, and lighting goals. The D3 is particularly well-suited for rooms with higher ceilings or where greater light output and wider beam spread are needed.
HomeWorks Integration - Ketra requires HomeWorks QSX. We design and program your HomeWorks system so every Ketra fixture responds to your keypads, scenes, schedules, and Palladiom controls. A single "Dinner" scene can dim the Ketra downlights to warm 2,200K, lower the shades, and shift the accent lighting - all from one button.
Natural Show Programming - This is where Ketra becomes extraordinary. We program Natural Show to track the actual position of the sun at your home's GPS coordinates, automatically shifting the color temperature and intensity of your Ketra fixtures throughout the day to mirror natural daylight. Your home feels connected to the outdoors even when every shade is drawn.
Vibrancy Tuning - We calibrate Ketra's Vibrancy control for your specific art, finishes, and materials. Vibrancy adjusts the spectral recipe of white light to reveal hidden depth in colors and textures without changing the color temperature - a feature unique to Ketra that makes artwork, stone, wood, and fabric come alive under light.
Professional Installation - Our team handles all rough-in coordination for new construction, retrofit installation for existing homes, and complete wiring and system integration. Every fixture is positioned, aimed, and tested in your actual space.
Ongoing Support - We provide 24/7 support for every system we install. Scene adjustments, firmware updates, Vibrancy retuning after new artwork - we handle it all, remotely or on-site, for as long as you own your home.
FAQ
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Most LEDs produce a fixed color of white light from a single channel. Ketra mixes four channels - red, green, blue, and white - simultaneously to produce light that behaves the way natural sunlight does. The result is richer color rendering, more natural skin tones, and a quality of light that no single-channel LED can match. It's the difference between light that illuminates a room and light that transforms it.
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Ketra produces light from 1,400K - a deep, warm amber glow like candlelight - all the way to 10,000K, the crisp blue-white of an arctic sky. This is the broadest range of any residential light source available.
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All LEDs shift in color over time as the components age. You've probably noticed this - fixtures that looked warm when new gradually turn cooler or greenish over the years. Ketra's Color Lock technology monitors light output 360 times per second and automatically compensates to maintain perfectly consistent color for the lifetime of the fixture. The light on day one is the light on day ten thousand.
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Vibrancy is a control unique to Ketra that adjusts the spectral recipe of white light without changing the color temperature. Increasing Vibrancy makes colors, textures, and materials appear more vivid and saturated - revealing hidden depth in artwork, stone, wood grain, and fabric. Decreasing Vibrancy creates a softer, more muted atmosphere. No other light source offers this level of control.
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Natural Show is Ketra's circadian automation feature. When programmed through HomeWorks, Ketra tracks the actual position of the sun based on your home's GPS coordinates and automatically shifts color temperature and intensity throughout the day to mirror natural daylight. Cool and energizing in the morning, warm and relaxing in the evening - without any manual input or scheduling. Your home stays in sync with nature even when you're indoors all day.
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No. Ketra requires Lutron HomeWorks QSX. If you have a RadioRA 3 system and want intelligent lighting, Lumaris is the product designed for RA3 - and it offers tunable white and RGB in tape light and downlight form factors. If you want Ketra, we can design a HomeWorks system for your home or discuss a phased upgrade path.
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Ketra covers 1,400K–10,000K with full-spectrum color, 16.7 million colors, Vibrancy control, and Color Lock. Rania covers 1,800K–5,500K with exceptional natural white light and 90+ CRI - but without full RGB color, Vibrancy, or Color Lock. Rania delivers approximately 80% of Ketra's white light quality at a lower investment. Many homes use both - Ketra in the showcase spaces, Rania in the supporting rooms.
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Ketra is available as D2 new construction downlights (2-inch aperture, fixed, adjustable, and wall wash), D3 new construction downlights (3-inch aperture for larger beam spread and higher output), D2 remodeler downlights for finished ceilings, A20 standard lamps, S30 and S38 PAR lamps for track and accent lighting, and linear fixtures for architectural applications.
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Yes. Ketra's gradual, automatic shift in color temperature throughout the day supports your body's natural circadian rhythm. Cool, bright light in the morning promotes alertness and energy. Warm, dim light in the evening supports natural melatonin production and better sleep. Multiple studies have shown that exposure to natural-spectrum light improves mood, focus, and sleep quality.
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In the rooms that matter most - where you spend the most time, display art, entertain guests, or where sleep quality is a priority - Ketra delivers a quality of light that nothing else can match. For supporting rooms, hallways, and utility spaces, Rania or Lumaris may be all you need. We design most homes with a mix of all three, optimizing the investment where it has the greatest impact. Your consultation will help determine the right balance.
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Yes. Ketra is a professional-grade lighting technology that requires certified Lutron dealer specification, HomeWorks system design, programming, and installation. VIP Smart Homes is a certified Lutron dealer serving Greater Seattle with over 20 years of experience.