I just did a quick test, Sam and this is the code you need. { version { number 4.01 } light LIGHT1 { storageOffset 0 0.3487 0 geomResource 7 lightType 0 name LIGHT1 on bend 1 dynamicsLock 1 hidden 0 addToMenu 1 castsShadow 1 includeInDepthCue 0 parent UNIVERSE channels { kdIntensity INTENSITY { name GetStringRes(1028,22) initValue 1 hidden 0 forceLimits 0 min 0 max 100000 trackingScale 0.004 keys { static 0 k 0 0.25 } interpStyleLocked 0 } } } } If you save that with an .lt2 extension and put it into your Lights folder, it will set the intensity to 25%. There are a few unnecessarry lines in it, but basically it'll work. If you want it to dim all 18 lights at once, you could duplicate the part for each light, renaming them from Light1 to 2,3, etc. and resave it. The relevant line is k 0 0.25 where 0,25 is 25% mac