Adding CSS file using hook_init for single table

The CSS file apachesolr.css was added for ALL admin pages using hook_init . Meanwhile, CSS styles are applying for apachesolr module settings form only. Seems to me, it would be better to attach the CSS file for settings form only.

function apachesolr_init() {
  if (arg(0) == 'admin') {
    // Add the CSS for this module
    drupal_add_css(drupal_get_path('module', 'apachesolr') . '/apachesolr.css');
  }
}