▁When ▁wind ▁spe eds ▁reach ▁Force   6 ▁or ▁higher , ▁the ▁tower ▁is ▁closed ▁for ▁safety ▁reasons . ▁ ▁Techn ical ▁details ▁ ▁The ▁l ighth ouse ▁was ▁built ▁in ▁ 1 8 8 7 / 1 8 8 8 ▁of ▁brick ▁construction . ▁It ▁was ▁taken ▁into ▁service ▁on ▁ 1 9 ▁November ▁ 1 8 8 8 . ▁It ▁was ▁modified ▁from ▁ 1 9 2 7 ▁to ▁ 1 9 2 9 ▁and ▁fitted ▁with ▁a ▁rein for ced - con crete ▁shell . ▁It ▁is ▁ 2 8   met res ▁high ▁and ▁has ▁a ▁foc al ▁height ▁of ▁ 9 5   met res ▁above ▁mean ▁sea ▁level ▁in ▁the ▁Balt ic ▁Sea . ▁The ▁observation ▁gallery ▁is ▁located ▁at ▁a ▁height ▁of ▁ 2 0   met res . ▁Its ▁light ▁has ▁the ▁following ▁ranges : ▁white ▁ 2 4 . 9 ▁na ut ical ▁miles ▁( 4 5   kil omet res ) ▁and ▁red ▁ 2 1 . 3   na ut ical ▁miles ▁( 3 8   kil omet res ). ▁Its ▁characteristic ▁is ▁Flash ing ▁White ▁Red , ▁ 2 . 4   seconds ▁on , ▁ 7 . 6   seconds ▁off . ▁Its ▁light ▁source ▁is ▁a ▁metal - hal ide ▁lamp . ▁The ▁Str als und ▁Water way ▁and ▁Sh ipping ▁Office ▁has ▁responsible ▁for ▁the ▁serv icing ▁and ▁maintenance ▁of ▁the ▁tower ▁since ▁ 1 9 9 0 . ▁ ▁Post age ▁st amps ▁ ▁The ▁first ▁post