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What kind of bike are you looking at upgrading with the LEDs? It will help with recommendations for some parts, although I have to admit I only have real-world LED experience with the late-model Paralever GSs. I have owned twin-shock models, so can offer some advice in places for them, but will be using some of Les_Garten's experiences to supplement my knowledge...
So the bike model will help, as well as what result you are looking for in various mods (stop modulation, running lights, overall conspicuity, bulb longevity, etc.).
Current: 93 R100GS, 04 XR650L
Prior: 73 CB350, 77 R100/7, 83 R100RT
I love every motorcycle I've owned and even some that I haven't.