Data Sheet

International Patent N° WO 2013/024501 A1
Advanced Optics for LED Projector with FRESNEL or PLANAR-CONVEX Lens
DE SISTI LED FRESNELS – LIGHTING QUALITY FIRST:
When choosing a FRESNEL you are expecting:
 Appropriate and effective Focusing Range from Spot to Flood
 Single shadows and their consistency within the Flood Field
 Even and wide Flood with appropriate Barn-door capability
This is exactly what you get with the DE SISTI LED FRESNELS.
The Internationally Patented Optical system specifically developed by DE SISTI to optimize the
use of a LED Engine Technology in combination with a Fresnel Lens (or a Plano Convex) is
providing to the DE SISTI LED FRESNELS the exact same lighting projection you would expect
from a Standard Fresnel.
The following EXAMPLE SHOWS a COMPARISON between:
LED FIXTURE by “OTHERS”
NOT REAL FRESNEL performances
 The Beam in full flood is NARROW
(only 45°) and shows an HOT SPOT
(large area to go from Beam to Field
Angle)
 The Barndoor in a NOT REAL FRESNEL
optics does not work properly: the
projection is OVAL and the more you
barndoor the more you dim the central
beam
LED FIXTURE by “DE SISTI”
EXACT FRESNEL performances
 The Beam in full flood is LARGE (above
50°), even and flat (No Hot Spots and rapid
passage from Beam to Field Angle)
 The Barndoor on the DE SISTI LED
FRESNEL has exactly the same functionality
obtained with a PROPER FRESNEL optics.