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This should answer your questions about the different options
https://www.bumm.de/files/PDF/Catalogue%202020%20ENGLISH.pdf
generally plus does indeed mean standlight or not, but just because a model doesn't have plus in the name it doesn't mean it doesn't have a standlight. i.e. the IQ-X
see page 26
https://www.sjscycles.co.uk/lighting-hub-dynamo-front/?order=price+ascending&brand=busch%5F%5Fmuller&price=17%2D30of the 5 lights here, the "Busch & Muller Lumotec Lyt T Senso" seems like the best buy, no? I think it's the brightest one with a stand light? (why do they even make lights without a stand light?)