Luminosity effects for a) H-strong sdO2 stars; b) He-strong sdO2 stars; c) H-strong sdO8 stars; and d) He-strong sdO7 stars. The lines marked are HeI λλ 4121, 4144, 4387, 4471, 4713; CIII/CIV/NIII λ 4630 broad absorption feature; NV λ 4604-20; OIV λ 4632; CIV λ 4658 blend; H + HeII λλ 4101, 4340, 4861; HeII λλ 4200, 4541, 4686; and λλ 4325–9, 4365, 4510–11, 4599–4601, 4615, 4651, 4705, 4776, 4828 emission.
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