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LED lamps emit omnidirectional light, where the emission angle is 120°. They may also be equipped with supplementary lenses to focus the beam or with performance optics to adjust the light beam.
Luminous flux: this value indicates the radiated power emitted by the LED source (1 m).
Luminous efficacy: this parameter is the most useful indicator for determining the right fixture because it represents the ratio between the luminous flux (lm) and the amount of power consumed by the lamp to produce it.
<h2 class="p1">Output luminous flux and power </h2>
The luminous flux emitted by the light source stated by Disano in its catalogues may show a tolerance of ± 10% with reference to the reported values.
The W tot column (except for the emergency versions, of which values are to be provided upon request) indicates the total wattage absorbed by the entire system (LED + driver) and will not exceed 10% of the reported value.
The values reported in the relevant column refer to the luminaire’s ambient temperature “tq”.
tq = temperature of the environment surrounding the luminaire with reference to a specific performance.
<h2 class="p1">Nominal luminous flux and power </h2>
In some cases Disano uses and reports the values provided by manufacturers regarding the LED’s nominal luminous flux (Ta=25°C) with a tolerance of ± 10% compared to the reported value. 
The W column indicates the nominal power of the LED module. 
The values indicated in the relevant column regarding the LED module refer to a specific temperature. 
For the LED CHIP the reference is “tj”, and for the COB LED the reference is “tp”.
tj  =  temperature of LED’s internal junction point. 
tp = temperature of the LED module’s outer surface

Luminous flux and power