HAVE HAD Seiko IN THE PAST AND WAS HESITANT TO GET A SO CALLED SOLAR WATCH, BUT IT WORKS GREAGT LIKE Seiko BEFORE. THERE IS NO BLUE LIGHT FOR CHECKING THE TIME IN THE DARK, HOWE VER FOR PERHAPS AN HUR OF SO IT DOES ILLUMINATE A LITTLE IN THE DARK.  BEAUTIFUL WATCH AND LOVE IT.  ORDERED A MORE CASUAL BAND FOR IT AND WILL KEEEP THIS ONE FOR BACK UP IN THE FUTURE,