PS performance wise it might be 'heavier' on your setup than vividian enb, if you want decent performance without completely turning off effects, I'd recommend disabling supersampling and tuning down the SizeScale & SourceTexturesScale values under Reflection and SSAO.
I should probably mention that I am used to using Quick Light (Wearable Lanterns alternative) for looting purposes in dungeons and caves though. Changing the brightness settings for interiors and nights in the Vivid Weathers MCM did a decent job with other darker ENBs, but after switching to Organic ENB I set the VW MCM options back to default. Higher settings mean brighter effect but the ones labeled curve help to.
It comes with an increased brightness option but so far I've been using the default settings and the lighting seems to be quite balanced. You can look into changing these settings to increase the brightness. Not using Claralux, but I also switched to Organic ENB v2 for Vivid Weathers this week.
