How much visible light reaches this surface?
LUX measures illuminance in lumens per square meter. Use it for desks, counters, shelves, aisles and other working or viewing surfaces.
Indoor Lighting Measurement Guide
Measure More Than Brightness.
One LUX reading tells you how much visible light reaches one point. A better indoor-lighting evaluation can also consider distribution, color temperature, supported blue-light parameters and repeatable measurements across the space.
Core measurements
Different numbers answer different lighting questions.
Illuminance, color temperature and blue-light parameters should not be treated as interchangeable. Each one describes a different part of the lighting environment.
The same illuminance question in another unit.
Foot-candle is lumens per square foot. Use whichever unit matches your workflow, standard or customer requirement.
Does the supported white light appear warmer or cooler?
Correlated color temperature provides a Kelvin value for the apparent warm-to-cool character of supported white-light sources.
How do supported white LEDs compare?
AH-300 can display blue-light irradiance and percentage for supported white LED sources as a technical comparison parameter.
Lighting distribution
One point can look acceptable while the room is still uneven.
Indoor-lighting decisions often depend on distribution, not only peak brightness. Record repeatable positions across the work surface or room to see where light falls off and where brighter or darker zones appear.
Build a simple measurement grid
Use consistent positions across a desk, aisle, shelf, workstation or room. Keep sensor height, orientation and relevant lighting conditions consistent.
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Compare the pattern, not just the highest number
A multi-point map can show whether one fixture creates a bright center, dark edges or inconsistent working conditions across the same space.
Compare like with like: same room, same fixture settings, same measurement height,
same sensor orientation and the same measurement positions.
Indoor applications
The same meter can answer different questions in different spaces.
Start with the task and the surface being evaluated. Then choose the measurement points that represent how people actually use the space.
Desk lighting
Compare workstations, identify darker desks and document CCT or supported white-LED differences between fixtures.
Displays & shelves
Check whether merchandise receives consistent illuminance across shelves, counters and display zones.
Aisles & work areas
Map multiple positions to see where illumination drops between fixtures or along storage aisles.
Desks & teaching surfaces
Compare student desks, presentation areas and other task surfaces rather than relying on one reading at the center of the room.
Color-selection areas
Use illuminance and CCT together when checking whether different work areas are being evaluated under comparable supported white-light conditions.
Guest-room lighting
Compare bedside, desk, vanity and general-room lighting without assuming one fixture represents the full space.
Aisles & product zones
Record multiple points across product displays to identify uneven brightness or differences between fixture zones.
Task lighting
Measure at the actual work surface and compare neighboring stations under repeatable conditions.
AquaHorti indoor lighting tool
AH-300: one handheld workflow for brightness, CCT and supported white-LED comparison.
AH-300 is designed for practical indoor-lighting checks where one illuminance number is not enough and you want to record multiple positions for comparison.
Indoor lighting
AH-300
Handheld LUX / foot-candle, CCT and supported blue-light measurement with multi-point recording and spectrum preview.
- LUX / foot-candle measurement
- CCT measurement
- Blue-light irradiance
- Blue-light percentage
- Multi-point LUX recording / mapping
- Spectrum Preview
- CSV export
Best for: offices, retail spaces, warehouses, classrooms,
studios, hotels, supermarkets and other indoor locations where brightness,
distribution and supported white-light characteristics need to be compared.
Important measurement scope:
AH-300 is intended for supported white LED sources based on blue/violet excitation.
Its Spectrum Preview is not a laboratory spectrometer. Blue-light percentage is a
technical comparison parameter and should not be used as a medical or health-risk judgment.
For grow lights containing strong 660 nm red, HPS, CMH, halogen, fluorescent or other unsupported
source types, use a measurement tool designed for that source and application.
View AH-300 →
Measurement workflow
Measure → Map → Compare → Adjust.
A repeatable workflow makes indoor-lighting measurements more useful than isolated readings taken at random positions.
Step 1
Measure
Take the reading at the surface or position that represents the real task.
Step 2
Map
Repeat at consistent points across the room, desk, shelf or aisle.
Step 3
Compare
Look at distribution, CCT and supported white-LED parameters under comparable conditions.
Step 4
Adjust
Change fixture position, output or layout, then measure the same points again.
Quick answers
Indoor lighting measurement FAQ
What is the difference between LUX and foot-candle?
Both are illuminance units. LUX is lumens per square meter, while foot-candle is lumens per square foot. They describe the same type of measurement in different units.
Why measure CCT together with illuminance?
Illuminance tells you how much visible light reaches a surface. CCT describes the apparent warm or cool character of supported white-light sources. The two measurements answer different questions.
Why take multiple LUX readings instead of one?
Multiple readings reveal how light is distributed across the space. This can expose bright centers, dark edges or inconsistent work surfaces that a single reading would miss.
Is AH-300 a full spectrometer?
No. AH-300 provides a Spectrum Preview for supported white LED sources, but it is not a laboratory spectrometer and should not be treated as one.
Can the AH-300 blue-light percentage be used for medical decisions?
No. Blue-light irradiance and percentage are technical lighting-comparison parameters. They are not intended for medical diagnosis, treatment decisions or health-risk assessment.
Brightness → Distribution → CCT → Comparison
Evaluate the light where people actually work, shop, learn or create.
Start with the surface and decision that matter. Measure more than one point, compare like with like, and use AH-300 when the source and measurement scope match the instrument.