The Light Analysis Render Element provides a visual representation of the lighting intensity in the rendered frame. It maps Illuminance and Luminance information as a color gradient or a grid of measured values onto the frame. 

The Illuminance and Luminance channels are internally created during rendering. 

During the rendering, the Lighting Analysis might display some approximation to the false-color image, but that is not the final result. After the rendering is finished, every parameter change made in the Asset Editor updates the render result in the VFB.

Quantity – Chooses which lighting information to be analyzed.

Illuminance (lx) – Uses the Illuminance of the rendered frame in lux.
Luminance (cd) – Uses the Luminance of the rendered frame in candelas.

Minimum Value – Specifies which values are mapped to blue.  

Maximum Value – Specifies which values are mapped to red. 

Scale – Specifies how values are mapped to colors onto the frame. 

Linear – The colors are mapped in a linear scale. 
Logarithmic – The colors are mapped in a logarithmic scale.  

Display Mode – Specifies the analyzed data display mode. 

False colors –  Fills the frame with a gradient ranging from blue (low values) to red (high values). For the out of range values, it uses respectively black and white.
Grid overlay – Displays the values at distinct grid points over the frame. They use the same grading colors. 

Draw Legend – When enabled, shows a legend of the false colors at the bottom of the render.