Theoretical consideration of illuminance intensity around a distance near LED light source

Modeling Distance Dependence of Led Illuminance*

The effect of distance from light source on light intensity from curing lights.

PURPOSE To investigate how light intensity changes as the distance increases from the tip of the light guide. MATERIALS AND METHODS Ten different curing light/light guide combinations were used. Light intensity was measured at 0, 3, 6, and 10 mm from the tip of the light guide with a radiometer. Measurements were repeated in five separate trials and the mean light intensity +/- standard devia...

Curing efficiency of high-intensity light-emitting diode (LED) devices.

We evaluated the curing efficiency of 4 high-intensity light-emitting diode (LED) devices by assessing percentage of residual C=C (%RDB), surface microhardness (SM), depth of cure (DC), percentage of linear shrinkage-strain (%LS), and percentage of wall-to-wall contraction (%WWC). The light-curing units tested were a QTH light, the Elipar TriLight (3M/ESPE), and 4 LED devices - the Allegro (Den...

Design of axisymmetrical tailored concentrators for LED light source applications

In our contribution we present a solution to an important question in the design of a LED-based illumination engine for projection systems: the collimation of the LED light. We tested the principle in the modification of a common device in non-imaging optics, the compound Parabolic Concentrator. This CPC-like achieves a collection of 72% (ideal reflective coating presumed). This CPC-like was ta...

comparing the effect of light tip distance curing units led & halogen on z250 composite microhardness

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