  The desiderata for an ideal photon source are high brightness, high
single-photon purity, and high indistinguishability. Defining brightness at the
first collection lens, these properties have been simultaneously demonstrated
with solid-state sources, however absolute source efficiencies remain close to
the 1% level, and indistinguishability only demonstrated for photons emitted
consecutively on the few nanosecond scale. Here we employ deterministic quantum
dot-micropillar devices to demonstrate solid-state single-photon sources with
scalable performance. In one device, an absolute brightness at the output of a
single-mode fibre of 14% and purities of 97.1-99.0% are demonstrated. When
non-resontantly excited, it emits a long stream of photons that exhibit
indistinguishability up to 70%---above the classical limit of 50%---even after
33 consecutively emitted photons, a 400 ns separation between them. Resonant
excitation in other devices results in near-optimal indistinguishability
values: 96% at short timescales, remaining at 88% in timescales as large as 463
ns, after 39 emitted photons. The performance attained by our devices brings
solid-state sources into a regime suitable for scalable implementations.
