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Being sealed units it is hard to tell but if the front lens is yellowed and crazed then the reflector may be gone too, which has a dramatic effect on output. Totally bodge way of checking - shine a bright torch into the headlamp - at certain angles it should still blind you with the brightness reflected.
and about alignment - I never thought twice about it until I had lowered my car, with the rear lower than the front. Headlights pointed up and no light ahead. re-aligned and it was fine.
TRA
http://www.partsforvolvosonline.com/product_info.php?cPath=515_671_676_714&products_id=4305
£60/corner, I'll grab a pair if the reflectors look janky (when I work out how to look at their condition!)