Blink and You'll See It Letterbox Hybrid

Come one come all to search for thy treasure.

When the sky is dark, as dark as tar

Of what worth dost thou measure

If the persuit of this quest, 'twas but par?

Coordinates are given and rightly so.

Once thou hast arrived, how is it to be known?

Which way dost thou go?

Rows upon rows for thou to beset, yet one stands out alone.

It's radiance created not by steel and spark.

For its light doth blink

as electron and diode shatter everpresent dark

There is where thou shalt put thine ink.

Letterboxers, you know what to do with the stamp, if you don't, you can just sign the logbook like you would any geocache. 

Please replace well hidden and be stealthy.