Objectives
By the end of this lesson.
- Understand the logic of a photometric distribution.
- Match an IES/LDT file to the correct luminaire variant.
Light distribution
A photometric curve shows how luminous intensity varies by direction. Wide, narrow, asymmetric or specific to shelving: the optics must suit the project geometry.
Same luminous flux, different result
Two luminaires with the same luminous flux can produce very different illuminance and uniformity. Distribution is therefore as important as the number of lumens.
IES and LDT
IES and EULUMDAT/LDT formats allow photometric data to be imported into calculation software. They must remain associated with a clearly identified product reference and variant.
Choosing the optics
Optics are selected according to height, spacing, relevant areas, obstacles, viewing angles and the required uniformity or accent lighting.
