LUMINOSIT
The science of light, made practical — photometry in plain English, plus the lumen, lux, candela, and energy calculators every lighting decision needs.
From converting lumens to lux and watts to lumens, to sizing a room's lighting, decoding a beam angle, projecting brightness over distance, and costing an LED switch, Luminosit pairs free hands-on photometry calculators with plain-English guides and a richly illustrated museum of light. Understand light, light spaces better.
Lighting & Photometry Calculators
Free tools for anyone working with light — lumens to lux, watts to lumens, room lighting requirement, candela to lumens, lux at distance, and LED energy savings.
Lumens ↔ Lux Calculator
Convert total light output in lumens to the brightness that lands on a surface in lux for a given floor area — and work backwards to the output you need to buy
Watts to Lumens Calculator
Estimate a bulb's brightness from its wattage and luminous efficacy, with LED, CFL, halogen, and incandescent presets and the equivalent wattage of each technology
Room Lighting Requirement Calculator
Size a room's lighting from its floor area and the recommended lux for the task — the total lumens it needs and how many bulbs or fittings that takes
Candela ↔ Lumens Calculator
Move between luminous intensity in candela and total beam output in lumens using the beam angle — the link every spotlight and torch spec depends on
Lux at Distance Calculator
Apply the inverse-square law to find the illuminance a source casts at a distance, and the distance at which it reaches the light level you want
LED Energy Savings Calculator
Compare the yearly energy and running cost of an LED against an old incandescent or halogen bulb, scaled by how many bulbs you swap and for how long
Museum of Light
Wander an immersive museum of light in all its forms — the sources that glow from the Sun and fire to the LED and the laser, the lamps and luminaires that shape our nights, the optical phenomena light paints across the sky, and the science of color and the spectrum behind it all, each in its own gallery, so you can get to know the stories behind every kind of light: where it comes from, how it works, and why it looks the way it does.
Tour the museum →From the Journal
Fresh guides on lumens and lux, color temperature and CRI, choosing LED bulbs, lighting a room or a workspace, cutting glare, and getting more light for less energy, plus plain-language explainers on the science behind it.
The Science and Art of Light Calibration: Precision in Illumination
The Future of Illumination: Innovative Lighting Solutions for Modern Living Spaces
The Transformative Power of Architectural Lighting in Modern Design
The Artistry Behind Stage Lighting: Crafting Atmosphere Through Light
The Science and Art of Light Control: Mastering Illumination for Health, Efficiency, and Aesthetics
The Radiant Realm of Light Fixtures: Illuminating Your Space with Style and Functionality
Keep Learning
Plain-language explainers on the science of light, the units that measure it, the lamps and bulbs that make it, and the craft of lighting a space well — everything you need to dig deeper into how light really works.
Visit the Learn hub →