[netr0ute]

I don't know if this is how it actually works, but here's my hunch. The ISL says that the energy will decrease by 4 (AKA, spread out over twice the arc length) for a distance increase of 2x. Note that it doesn't specify any actual distance, just a ratio. If you concentrated the energy so that the arc length is what you want at distance ratio 1, then the ISL doesn't apply because you will always be staying at ratio 1 as long as the solar system doesn't go any closer or further.