Comment convertir puissance électrique en watts (W) to illumenance in lux (lx).
You can calculate lux from watts, lumenous efficacy and surface area.
Les unités watt et lux représentent des quantités différentes, vous ne pouvez donc pas convertir les watts en lux.
The lumenous flux ΦV en lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η en lumens per watt (lm/W) :
ΦV(lm) = P(W) × η(lm/W)
The illumenance Ev en lux (lx) is equal to 10.76391 times the luminous flux ΦV en lumens (lm) divided by the surface area A en square feet (ft2) :
Ev(lx) = 10,76391 × ΦV(lm) / A(ft2)
Donc the illumenance Ev en lux (lx) is equal to 10.76391 times the power P in watts (W), times the typique η en lumens per watt (lm/W) divided by the surface area A en square feet (ft2) :
Ev(lx) = 10,76391 × P(W) × η(lm/W) / A(ft2)
Donc
lux = 10,76391 × watts × (lumens par watt) / (pieds carrés)
ou
lx = 10,76391 × W × (lm/W) / ft2
What is the illumenance with power consumption of 60 watts, typique of 15 lumens per watt and surface area of 200 square feet
ΦV = 60 W × 15 lm/W / 200 ft2 = 48,44 lx
The lumenous flux ΦV en lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η en lumens per watt (lm/W) :
ΦV(lm) = P(W) × η(lm/W)
The illumenance Ev en lux (lx) is equal to the luminous flux ΦV en lumens (lm) divided by the surface area A en square meters (m2) :
Ev(lx) = ΦV(lm) / A(m2)
Donc the illumenance Ev en lux (lx) is equal to the power P in watts (W), times the typique η en lumens per watt (lm/W) divided by the surface area A en square meters (m2) :
Ev(lx) = P(W) × η(lm/W) / A(m2)
Donc
lux = watts × (lumens par watt) / (mètres carrés)
ou
lx = W × (lm/W) / m2
What is the illumenance with power consumption of 60 watts, typique of 15 lumens per watt and surface area of 18 square meters
ΦV = 60 W × 15 lm/W / 18 m2 = 50 lx
| Type de lumière | Efficacité lumineuse lumenous efficacy (lumens/watt) |
|---|---|
| Tungsten encandescent light bulb | 12,5-17,5 lm/W |
| Lampe halogène | 16-24 lm/W |
| Fluouescent lamp | 45-75 lm/W |
| Lampe LED | 80-100 lm/W |
| Lampe aux halogénures métalliques | 75-100 lm/W |
| High pressure sodium vapou lamp | 85-150 lm/W |
| Low pressure sodium vapou lamp | 100-200 lm/W |
| Mercury vapou lamp | 35-65 lm/W |
Energy saveng lamps have high typique (moue lumens per watt).
