In an era where air pollution are ubiquitous, air purifiers have evolved from "optional appliances" to "essential guardians." Cobectal air purifiers, with their four-color intelligent lighting system, transform abstract air quality data into an intuitive visual language, allowing users to instantly understand indoor air conditions without professional equipment. This design is not only an innovation in product interaction but also a profound interpretation of the concept of "visualizing respiratory health."
4-color Lighting: Visual air quality
Cobectal's four-color lighting system establishes a clear "air health color spectrum" based on PM2.5 concentration, with each color corresponding to a specific pollution range and purification strategy:
1. Blue: 0-35μg/m³ (Excellent)
When the indicator light turns blue, it means the indoor PM2.5 concentration is within the excellent range of 0-35μg/m³ (meeting the World Health Organization's optimal daily average standard). At this time, the air is as pure as that in a mountain forest at dawn, very friendly for those who have a cough and a dry, itchy throat.
Machine operation status: The fan works at the lowest speed with operating silently, and the noise is close to the ambient background sound (usually ≤30 decibels). Even when placed beside the bed in the bedroom, it will not disturb sleep. This "light protection" mode maintains high-quality air while minimizing energy consumption and noise.
From a health perspective, PM2.5 in this range hardly irritates the human body. Long-term exposure to such an environment can effectively relieve our coughs and dry, itchy throats . For users pursuing extreme sleep quality, the "silence + purification" dual guarantee in blue mode is a "sleep-friendly" design.
2.Green: 36-75μg/m³ (Good)
Green corresponds to the good range of 36-75μg/m³. At this time, the air is still "good" but contains slight pollutants (such as daily dust or pollen carried in through the ventilation system from outside).
Machine operation status: The fan speed increases moderately , working silently like an "air helper" — it will not disturb conversations or work due to excessive wind speed, yet can quickly intercept gradually accumulating pollutants to prevent them from sliding into "moderate pollution."
This range is common in indoor environments after daily ventilation or in closed spaces during mild haze days. The green light lets users clearly know that "the air is acceptable, but purification needs to be maintained," helping prevent pollution escalation due to negligence.
3.Yellow: 76-115μg/m³ (Moderate Pollution)
Yellow warns that the indoor PM2.5 concentration has entered the moderate pollution range of 76-115μg/m³. At this point, the air can be perceived by the human body: sensitive groups may experience nasal itching and dry throat. This state may be triggered by outdoor haze or the spread of kitchen fumes.
Machine operation status: The fan performs powerful purification at medium-high speed, quickly diluting pollutants by increasing air intake. The yellow light is both a "warning signal" — prompting users to reduce pollution sources (such as closing windows or removing fumes) — and an "action command" — the machine has fully engaged in purification.
From the perspective of health risks, PM2.5 in moderate pollution begins to deposit in the respiratory tract, and long-term exposure may cause symptoms such as cough and rhinitis. The warning of the yellow light can prompt users to intervene in time (such as turning on the air purifier or strengthening ventilation) to block the continuous erosion of health by pollution.
4. Red: >116μg/m³ (Severe Pollution)
Red indicates that the PM2.5 concentration exceeds 116μg/m³, belonging to severe pollution (such as the air is filled with hair and pet dander everywhere) . At this time, the air is turbid and pungent, and long-term exposure may cause cough.
Machine operation status: The fan runs at maximum speed, acting like an "air first-aid device" to prioritize respiratory safety. The red light is both an "alarm" and a "reassurance" — the machine is removing pollutants with maximum power.
This mode is common when windows are opened during haze days, when decoration dust spreads, or when a large amount of cooking fumes are generated. The strong visual impact of the red light can instantly arouse users' vigilance, prompting them to take emergency measures (such as evacuating the polluted area or closing pollution sources) to cooperate with the machine for "rapid pollution control."
Auto Mode: Meaning of The Lights
The core support of the four-color lighting is Cobectal's high-precision PM2.5 laser sensor and intelligent algorithm, which together form a closed loop of "perception - decision - action":
1.Perception: Accurately "understanding the air"
When the air purifier is running, the built-in sensor actively detects PM2.5 particles; its photosensitive element captures the intensity and frequency of scattered light, which is then converted into real-time concentration through algorithms. The advantage of the built-in sensor lies in its fast response and high precision — even if the PM2.5 concentration fluctuates instantly (such as when opening a window lets in smoky/hazy air), it can be captured immediately.
2.Decision: Smart Adjustments Purifies Exactly When Needed
The built-in sensor of the air purifier dynamically adjusts the fan speed according to PM2.5 concentration:
Gradient response: When the concentration changes from 35→36μg/m³ (blue→green), the speed increases gently to avoid abrupt noise; when it changes from 115→116μg/m³ (yellow→red), it switches to maximum speed instantly to intercept pollution before it spreads.
Reverse adjustment: During purification, if the concentration drops from 150→100→50μg/m³ (red→yellow→green→blue), the speed will gradually decrease to achieve a balance between "efficient purification + energy-saving silence."
This "dynamic adaptation" mechanism ensures the machine does not waste energy due to "overreaction" nor miss purification opportunities due to "slow response," truly achieving "action only when necessary."
3. Feedback: At-a-Glance Status No Complicated Controls Needed
Traditional air purifiers require users to manually adjust gears, but Cobectal's auto mode + four-color lighting eliminates operation: users only need to turn on auto mode, and the light will "speak actively" — blue means "no need to worry," and red indicates "urgent need for purification." This seamless interaction is especially suitable for the elderly, children, or busy office workers.
Smart Colors for Your Daily Life
The value of the four-color lighting is not just "displaying data" but also serving as a "respiratory solution" adapted to different life scenarios:
1.Bedroom: blue guards sleep, red for emergency purification
Late-night sleep: The blue light is soft, and the purifier runs with near-whisper noise, creating a "silent purification" environment; if pollution occurs suddenly at night (such as dust from a construction site outside the window), the red light turns on instantly, and the machine purifies at high speed to ensure safe breathing even during sleep.
Morning window opening: If outdoor haze is severe, the machine turns red immediately and purifies at high speed, ensuring safe breathing during dressing and washing, avoiding "the first breath of dirty air in the morning."
2.Living Room: Green maintains daily quality, yellow responds to emergencies
Daily activities (watching TV, chatting): Under green light, the machine runs quietly, silently removing pet hair, dust, and second-hand smoke residues, keeping the living room in a "comfortable breathing level" environment.
3. Kitchen: Yellow for Kitchen Odors, Red for Turbo Smoke Control
For Everyday Cooking (simmering, boiling):
When your cooking creates light smoke or odors, the yellow light comes on. The purifier kicks into medium gear, creating an invisible barrier that keeps cooking smells contained to the kitchen - so your living room stays fresh and your whole house won't smell like dinner for hours.
For Heavy-Duty Cooking (frying, sautéing, spicy dishes):
When you're really putting your range to the test (we're looking at you, bacon and stir-fry nights!), the red light activates. The purifier teams up with your vent hood at maximum power, clearing even the heaviest smoke and strongest odors fast - because nobody wants their smoke detector joining the cooking party.
4.Newly Decorated Room: Red tackles formaldehyde-associated particles
Formaldehyde release in newly decorated rooms is often accompanied by wood chips and paint dust (PM2.5 sources). Under red light, the machine runs at high speed, not only removing particles but also assisting in purifying harmful gases through activated carbon filters. Users can intuitively judge the progress of decoration pollution purification through the light change from red→yellow→green→blue.
Clean Air You Can See - Health You Can Feel
The deep significance of the four-color lighting is to transform "abstract health risks" into "perceivable action signals":
1. Health warning: Yellow and red lights are visual warnings of "hidden pollution." For example, a seemingly clean room may quietly enter moderate pollution (yellow light) due to insufficient ventilation or accumulated pet dander. At this time, the light reminds users: it is time to clean the environment or replace the filter.
2.Effect verification: When the color changes from red→yellow→green→blue, users can intuitively see the "purification results," enhancing trust in the product and increasing willingness to use the air purifier over the long term — after all, "visible effects" are the best motivation.
3.Habit formation: By observing light changes over time, users can summarize rules (such as "the light always turns yellow after opening windows in the evening") and then adjust living habits (such as closing windows in the evening or turning on purification in advance), shifting from passive purification to active prevention, and truly integrating "respiratory health" into daily life.
Whether you're sleeping peacefully with blue lights assuring clean air, enjoying fresh breezes in green mode, seeing yellow alert you to cooking fumes, or watching red tackle heavy pollution - you'll appreciate how smart design makes healthy air effortless. That's the beauty of Cobectal's color-coded system: advanced protection that simply works.