Haven't worked with 12 volt landscape lights in quite awhile. Installed an LED system and was wondering how to correctly dim the lights that are way too bright. I have an electronic transformer rated at 200 watts. Would I install a dimmer on the line side of the transformer ( 120 V ) or the load side of the transformer (12 V)? I'm thinking I need an ELV dimmer on the load side but need some guidance.