i@raspberrypi:~ $ npm -g install homebridge-lightify-api
npm WARN engine homebridge-lightify-api@1.0.0: wanted: {"node":">=6.0.0","homebridge":">=0.2.0"} (current: {"node":"0.12.6","npm":"2.11.2"})
npm ERR! tar.unpack untar error /home/pi/.npm/homebridge-lightify-api/1.0.0/package.tgz
npm ERR! Linux 4.4.32+
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "-g" "install" "homebridge-lightify-api"
npm ERR! node v0.12.6
npm ERR! npm  v2.11.2
npm ERR! path /usr/local/lib/node_modules/homebridge-lightify-api
npm ERR! code EACCES
npm ERR! errno -13

npm ERR! Error: EACCES, mkdir '/usr/local/lib/node_modules/homebridge-lightify-api'
npm ERR!     at Error (native)
npm ERR!  { [Error: EACCES, mkdir '/usr/local/lib/node_modules/homebridge-lightify-api']
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   path: '/usr/local/lib/node_modules/homebridge-lightify-api',
npm ERR!   fstream_type: 'Directory',
npm ERR!   fstream_path: '/usr/local/lib/node_modules/homebridge-lightify-api',
npm ERR!   fstream_class: 'DirWriter',
npm ERR!   fstream_stack:
npm ERR!    [ '/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:35:25',
npm ERR!      '/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:47:53',
npm ERR!      'FSReqWrap.oncomplete (fs.js:95:15)' ] }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/pi/npm-debug.log
pi@raspberrypi:~ $ ^