Lighthouses

For literacy today we had to read a story and I learnt that in 1862 the Nelson Provincial Council announced that from 4 August and every night thereafter a beam would shine from dusk to dawn from a lighthouse at the boulder Bank the natural breakwater at Nelson Haven.
What I knew about them was that they have a very large light bulb and that they are heavy I just don't know how heavy. What I would like to know is where they buy the light bulbs from and how heavy they are. Light houses look very tall and they have stripes across the lighthouse. I think they look like candy canes. I Read another book aswell and it was called Bean Rock, The things I learnt from this book are.

-July 24 1871 Bean Rock was first built.
-By 1957 all the lighthouses around NZ has been converted to electricity
-1985 Bean Rock lighthouse was starting to show signs of age. The cottage was lifted off by an floating crane. It was renovated onshore, then replaced on the top of new set of foundations, wooden legs and repainted.