Basics & Technical
What lumens, lux, colour temperature and the deeper specs actually mean
Explore this path →Dear reader,
Get the light right, room by room.
I'm Ross. I test lamps, measure the light they actually give off, and explain lumens, lux and color temperature in plain English, so you can plan each room with numbers, not guesses.
No brand rankings. No mysterious rules. Just useful numbers, visible assumptions and a clear planning method.— Ross
Start here
Five ways in: basics, rooms, fixtures, tools and fixes.
Begin with definitions, find a room plan or browse the complete guide library.
Rooms & How-to
Plan each room, then follow the steps to lay it out
Explore this path →Fixtures & Buying
Bulbs, fixtures, buying checks and side-by-side choices
Explore this path →Tools & Calculators
Get a number you can plan with, with the formula shown
Explore this path →Troubleshooting
Start with the symptom and change one safe thing at a time
Explore this path →Room by room
Light where life happens
Begin with the activity, then place light where it needs to land.
100–200 lux
Living room
Layer ambient light with reading and wall light.
Read room guide →200–400 luxKitchen
Plan for worktops first, then the room.
Read room guide →100–200 luxBedroom
Keep general light soft and bedside light useful.
Browse room guides →300–500 luxHome office
Balance desk, screen and background brightness.
Read room guide →Room lumens calculator
Get a starting lumen number for your room.
This lumen-method estimate gives a planning range. It cannot account for every surface, shade or fixture optic.
“If a room feels gloomy, first check where the light lands.”— Ross's note
Latest guides
New from the library
Comparisons
3000K vs 4000K: What Changes in a Real Room?
Compare 3000K vs 4000K lighting by room, output, CRI, glare, fixtures and controls, then test both options under the same conditions.
Read guide →Keyword playbook
LED Strip Length, Voltage Drop, Power and TV Compatibility
Plan LED strip lights for a bedroom TV by checking route length, cut points, power, voltage drop, controller ratings and documented TV USB output.
Read guide →Rechargeable lighting
A Useful Rechargeable-Lamp Battery Indicator: What It Should Actually Show
Learn what a rechargeable lamp battery indicator should show, why runtime estimates vary, and how to assess charging, dimming and low-battery behavior.
Read guide →The Ross Light method
Observe. Measure. Explain. Adjust.
- 01Start with the task.Identify what needs to be seen and where the light needs to land.
- 02Make assumptions visible.Show the inputs, formula, sources and important limits.
- 03Change one variable.Adjust brightness, placement, shielding or color deliberately.
Know the boundary
Planning is not electrical work.
Permanent wiring, load calculations, code compliance, wet-location work and uncertain faults belong with a licensed professional. Read the troubleshooting guides for safe first observations.