From their website:
ElumTools is a calculation Add-in used to predict the performance of electric lighting systems within the Autodesk® Revit® Architecture or MEP software. With ElumTools the need to utilize external software to compute illuminance from light sources placed in Revit is no longer necessary.
Click HERE if you'd like to join their BETA Process. The pricing structure has not been defined yet, just TBD on their site.
Want to watch some videos?
ElumTools Test Drive
To get you started I've embedded the Overview Video.