How many halogens does a 20 m² living room need?

For a 5 × 4 m living room with a 2.8 m ceiling and 150 lux, eight 10 W halogens with a 60° beam (about 900 lumens each) are needed, arranged in two rows of four. With 7 W halogens, 15 are needed.

How far apart should the halogens be?

It depends on the beam angle and the ceiling height. With a 2.8 m ceiling and 36° to 60° halogens, a spacing of 90 to 140 cm is typical; the smaller the beam angle, the smaller the spacing must be to avoid patchy light.

How many lux does each space need?

Typically: bedroom 100, living and reception room 150 to 200, corridor 100, bathroom 200, kitchen 300, office 500 and shop 300 lux.

Halogen count and spacing from the wall | Free calculator

Enter the size and type of the space. You get the number of halogens needed for standard lighting, their spacing from each other and from the wall, and a simple layout sketch.

How many halogens are needed for 20 m²?

For a 5 × 4 m living room (20 m²) with a 2.8 m ceiling, general lighting of 150 lux is enough. With a 10 W halogen of about 900 lumens and a 60° beam angle, 8 halogens are needed: two rows of four along the length of the room. Along the length, the halogens are 125 cm apart and about 60 cm from the wall; the two rows are 2 m apart and 1 m from the walls. The average illuminance comes to about 157 lux. With 7 W, 550-lumen halogens, 15 are needed in three rows of five.

How is the halogen count calculated?

This calculator uses the lumen method which is the basis of indoor lighting calculation:

Count = (required lux × area) ÷ (lumens per halogen × utilisation factor × maintenance factor)

Required lux Depends on the use of the space (table below).
Utilisation factor Shows what share of the lamp's light actually reaches the work plane (75 cm above the floor). In a small room or a high ceiling, more light hits the walls and the factor is lower.
Maintenance factor (0.8) compensates for the loss of light over time and dust.

How many lux for each space?

Space	General lighting (lux)
Bedroom	100
Living and reception room	150 to 200
Corridor	100
Bathroom and WC	200
Kitchen	300 (500 over the counter)
Office	500
Shop	300
Restaurant and café	200

Halogen distance from the wall and from each other

Distance from the wall

For general lighting, the distance from the halogen to the wall is usually half the distance between the halogens so the corner does not stay dark. If you want the wall, board or cabinet itself to be lit, place the halogen 30 to 60 cm from the wall.

Distance between halogens

The smaller the beam angle and the lower the ceiling, the smaller the light spot, and the closer the halogens must be. With a 2.8 m ceiling and 36° to 60° halogens, a spacing of 90 to 140 cm is typical. A 24° halogen is for accent light, not general lighting.

Above the bed and TV

Do not place a halogen directly above the head position on a bed; a person lying down looks straight into the light. Do not place halogens in front of a television either, so the reflection does not fall on the screen.

Exact layout on your own plan

This calculator is for a rectangular space and a first estimate. In the Tlux software you send a PDF plan; for each room of any shape you get the exact position of the halogens, a lux map, a 3D rendering, a glare check and a ceiling cutting plan for the electrician.

Get to know the software Phone: 09140129007

Frequently asked questions

How far should a halogen be from the wall?

For general lighting, half the distance between the halogens; for example, if they are 120 cm apart, 60 cm from the wall. To light the wall, 30 to 60 cm.

Is a diffuser halogen better than a module halogen?

A diffuser has a softer spread, but its milky surface is visible from every angle and it catches the eye. A halogen with a deeper lamp (darklight) throws the light onto the surface and is less visible itself; for living rooms and bedrooms it is more relaxing.

Halogen count and distance from the wall