Lighting design

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Indirect lighting sizing calculator

Enter the room details – get strip metres, driver size, a lux estimate and the number of spotlights to top up.

Janne Halttu Janne Halttu · LedStore.fi ·

How the calculator works

The lux estimate for indirect light is based on the formula: total strip output (lm) × ceiling efficiency (%) / room floor area. Ceiling efficiency combines room height and ceiling reflectance – a white ceiling reflects 80-85 % of the light, wood panelling 40-55 %.

The number of spotlights is calculated to make up the missing lux. A LedStore 9 W spotlight produces 650 lm and with a 60° beam effectively covers about 3-4 m² at 2.5 m height.

How much light and sizing guide → · Driver sizing →

Step 1 – Room type

Target level

Step 2 – Dimensions

Step 3 – Strip power

Single-colour strip (SOLO COB / HELMI SMD)

CCT strip – adjustable colour temperature

Ceiling surface

Result

– Strip metres
– Total power (W)
– Min. driver (W)

Estimated lux on the floor – indirect light

–
0150300450600 lux

LedStore 9W spotlights needed to top up the lighting

– Spotlights to reach target
– Total lux (indirect + spotlights)

LedStore 9W spotlights → LED strips →

The calculator gives an indicative estimate. Actual lux depends on the room shape, surface reflectances, bulkhead structure and strip placement. Spotlight lux calculated at 2.6 m ceiling height with a 60° beam (LedStore 9W, 650 lm). Precise sizing from lighting design →

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