2008 and 2018 are very low-power (below 10 mW), 2025.16 "Inyo Dark Ditter" is 1.5 watts, so it might be the next obvious choice for long-DX rather than the lower freq. beacons. The "IDD" goes on at dusk and off sometime in the wee hours when the battery goes below 11 volts.
73 -v-