The Commissioners of Irish Lights hereby give notice that they intend to replace the present light at Blackrock Lighthouse (Mayo) with a solar powered light.
To facilitate the replacement of the existing light, a temporary light with reduced range will be exhibited for approximately one month commencing on the 12th July.
On or about the 3rd August 1999, or as soon thereafter as circumstances permit, a new solar powered light will be exhibited during the hours of darkness only.
The character, phasing, and ranges of the existing, temporary, and new solar lights are as follows:
EXISTING LIGHT:

Character:	Fl WR 12 secs 0.2 + 11.8 = 12 secs
Range:	22nm White 16nm Red
Sector:	White Vis. 276° - 212° (296°) Red Vis. 212° - 276° (64°)
Height above MHWS:	86 metres
Lighting Time:	24 hours

TEMPORARY LIGHT:

Character:	Fl WR 12 secs 1 + 11 = 12 secs
Range:	11nm White 9nm Red
Sector:	White Vis. 276° - 212° (296°) Red Vis. 212° - 276° (64°)
Height above MHWS:	85 metres
Lighting Time:	Hours of darkness

NEW SOLAR POWERED LIGHT:

Character:	Fl WR 12 secs 0.3 + 11.7 = 12 secs
Range:	20nm White 16nm Red
Sector:	White Vis. 276° - 212° (296°) Red Vis. 212° - 276° (64°)
Height above MHWS:	86 metres
Lighting Time:	Hours of darkness

The geographical position of Blackrock Mayo Lighthouse (A6270) is:
54° 04.0' N
10° 19.2' W
Radio Navigational Warnings will be issued on the establishment of the temporary light and on the commencement of the new solar powered light.