Umucyo wa Bollard, nanone witwa urumuri rwa posita, urumuri rwubusitani, ni ubwoko bwurumuri ruhagaze kumuhanda cyangwa muri nyakatsi. Niba uhisemo amatara yo hanze LED cyangwa amatara yizuba, itara ridafite amazi yo hanze hamwe no kubungabunga make hamwe nigiciro gito byakagombye kuba amahitamo yawe ya mbere. / / harimo amatara ya LED yubusitani, itara ryo hanze yubusitani hamwe nuburyo bukunzwe nigiciro cyuruganda.