sub set_light_times {
    my ($self) = @_;

    my $on_at = $self->_config_light('on_at');

    my $time = time;
    $time += 60 until localtime($time) =~ /$on_at:/;

    my $hrs = $self->_config_light('on_hours');

    my $on_time = $time;
    my $off_time = $on_time + $hrs * 3600;

    my $now = time;

    # check if the until() loop set things beyond today's
    # on period

    if ($now > ($on_time - 86400) && $now < ($off_time - 86400)){
        $on_time -= 24 * 3600;
        $off_time -= 24 * 3600;
    }

    $self->db()->update(
        'light', 'value', $on_time, 'id', 'on_time'
    );
    $self->db()->update(
        'light', 'value', $off_time, 'id', 'off_time'
    );

}