▁l amps ▁and ▁reflect ors , ▁subsequently ▁replaced ▁by ▁a ▁hel ical ▁lan tern ▁later ▁in ▁the ▁nin ete enth ▁century . ▁ ▁The ▁L ighth ouse ▁was ▁converted ▁to ▁automatic ▁operations ▁in ▁ 1 9 2 9 . ▁It ▁was ▁the ▁last ▁Tr inity ▁House ▁l ighth ouse ▁to ▁be ▁power ed ▁by ▁gas , ▁eventually ▁being ▁converted ▁to ▁electric ity ▁in ▁ 1 9 9 7 . ▁ ▁The ▁light ▁was ▁intended ▁to ▁help ▁coast al ▁traffic ▁trad ing ▁lim estone ▁and ▁coal ▁to ▁mid ▁and ▁north ▁Wales ▁but ▁the ▁light ▁also ▁helped ▁long - distance ▁and ▁north ▁American ▁traffic ▁identify ▁the ▁Br istol ▁Channel ▁and ▁avoid ▁confusion ▁with ▁the ▁English ▁Channel . ▁ ▁K ee per ' s ▁c ott ages ▁The ▁l ighth ouse ▁keep ers ' ▁ ▁c ott ages , ▁that ▁fl ank ▁the ▁L ighth ouse , ▁are ▁two - store y , ▁with ▁hi pped ▁roof s , ▁oct ag onal ▁chim ne ys , ▁and ▁a ▁one - store y ▁linking ▁cor rid or . ▁This ▁forms ▁a ▁‘ U ’ - shape , ▁with ▁the ▁L ighth ouse ▁at ▁the ▁centre ▁of ▁the ▁south ▁side , ▁and ▁en closed ▁gard ens ▁to ▁the ▁north . ▁The ▁c ott ages ▁were ▁built ▁around ▁ 1 8 6 8 - 7 0 ▁by ▁T . ▁C . ▁Har vey , ▁C . E . ▁ ▁In ▁art ▁Card iff ▁Central ▁Library ▁holds ▁a ▁was h ▁drawing ▁by ▁Charles ▁Nor ris ▁showing ▁the ▁L ighth ouse