Opacity – Controls the weight of the layer. A value of 0 means no effect and a value of 1.0 means full effect.

Enable bloom/glare – Enables the V-Ray Lens Effects.

Size – Specifies the size of the filter as percentage of the image's diagonal. See the Size example below.

Intensity – Multiplier for the bloom/glare source bright pixels. Increasing the value can boost the effect by simulating up to 20 times brighter source. Values lower than 1 can be used to produce subtle bloom/glare from overbright sources. See the Intensity example below.

Bloom – Controls the blend between bloom and glare. A value of 1 forces bloom to be applied to full extent and without any glare. A value of 0 removes the bloom completely and applies only glare. Values in-between blend the two effects proportionally. See the Bloom/Glare example below.

Threshold – Sets a minimum value for the rendered pixels to be considered as lens effects source. The Bloom/Glare effect is generated only regarding pixels with larger value than the specified threshold.

Rotation – Rotates the final result effect, regardless of this is a filter image or a procedurally created one. 

Saturation – When the value is set 0, the effects use the original hue of the bright pixels to create bloom and glare. Larger values intensify the hue set with the Cold/Warm option. See the Cold/Warm & Saturation examples below.

Hardware Accelerated – Enable to calculate lens effects on the GPU. When multiple devices are present, V-Ray prioritizes the best one available.

Cold/Warm – When enabled, the Bloom/Glare effect is toned to cold hues. When disabled, the effects receives warm hue. The hue shift requires Saturation values larger than 0. See the Cold/Warm & Saturation examples below.

Interactive – When enabled, the bloom/Glare effect is automatically recalculated and applied after any V-Ray lens effects parameter change.

Save Glare channel – When enabled, writes the glare channel to a file when writing all channels.

Update – Manually forces the recalculation of the bloom/glare effects.

Bake intensity – When enabled, the intensity is baked in the Glare channel. Otherwise, a default intensity of 1.0 is saved so that it can be adjusted via post-processing.

Create effectsResult channel – When enabled, it generates an effectsResult channel without needing the Denoiser render element to be active. Otherwise, the lens effects are applied to the RGB channel instead.