WHITEHOUSE DOWNLIGHT PLANNER
How Many Downlights Do I Need?
Enter your room size and a few simple preferences to estimate a practical starting quantity, see an illustrative layout and shortlist suitable Whitehouse downlights.
Step 1 · Room size
Tell us the size of the room
Enter the approximate internal room dimensions. The planner creates a practical starting estimate rather than a final lighting design.
Step 2 · Room type
What kind of space is it?
Different rooms normally need different amounts of usable light. These are practical planning baselines, not mandatory standards.
Step 3 · Preferences
Refine the planning estimate
Brightness is optional. You can also enter a known lumen output or existing ceiling cut-out if you have those details.
Step 4 · Light colour
Choose a colour temperature preference
Your estimate will appear here
Enter the room size, choose the room type, then calculate. You can revise any option and calculate again.
Planning note: this calculator is a practical starting point, not a final photometric or electrical design. Actual results vary with fitting output, beam angle, ceiling height, room colours, daylight, furniture and layout. Wet-area and electrical installation requirements should be verified for the selected product and installation.
Current catalogue matches
Recommended downlights
After calculating, we search the current Whitehouse catalogue using your colour preference. Recommendation precision will improve as verified lumen and cut-out data is completed.
Common planning questions
Downlight planning explained simply
How many downlights do I need per square metre?
There is no reliable fixed number per square metre. The required quantity depends on the light output of each fitting, the room's purpose, ceiling height, beam spread and the brightness you want. This calculator uses lumens and a room-based planning target instead.
What is a downlight cut-out size?
The cut-out is the diameter of the ceiling hole required by a recessed downlight. If you are replacing existing fittings, measuring the current opening can help narrow compatible products.
Should all downlights in one room use the same colour temperature?
Using the same colour temperature usually creates a more consistent appearance. Mixed colour temperatures can be used deliberately, but unplanned mixing may look uneven.
Is this a final lighting design?
No. It is a practical planning estimate intended to help shortlist products and quantities. Final performance depends on the exact fitting and room conditions.