My spotlights and ies light appear extremely yellow, am I missing anything?
The colour is set to pure white, white emissive materials appear correctly as do rectangle lights.
this quick example show the light cones from the ies lights very yellow, the lights for the wall lights are emissive materials.
Could you please share the project with us so we can investigate in detail? If this is alright, please send an archived copy (Extensions > V-Ray > Pack Project) to support@chaosgroup.com via email or a file-sharing service of your choice. Please reference this forum thread!
Additionally, please advise what is the full version number of V-Ray (Extensions > V-Ray > Help > About).