On the H10/2 in the evening, I'm pretty sure my front light does me more good than my tail light, both because of the difference it makes to visibilty and the hazards which it might mitigate, i.e. people pulling out of side roads. Vehicles approaching from behind have much longer to see me, probably aren't on tester-crossing orbits anyway, and are likely to see me silhouetted against the light horizon rather than the dark hedges, thanks to the different angle of their sightline.
On the H10/2 in the evening, I'm pretty sure my front light does me more good than my tail light, both because of the difference it makes to visibilty and the hazards which it might mitigate, i.e. people pulling out of side roads. Vehicles approaching from behind have much longer to see me, probably aren't on tester-crossing orbits anyway, and are likely to see me silhouetted against the light horizon rather than the dark hedges, thanks to the different angle of their sightline.