Apart from saying this is a fantastically luminous, bright orange, I think it is best to use Langridges description for this colour as it describes it up perfectly;
"Specially formulated bright semi-opaque orange based on Pyrrole Orange and Diarylide Yellow. Neon Orange has been created to give artists a medium-high value orange that literally ‘pops’ off the surface and looks as though generated by light. A permanent, bright yellow-orange, this colour bridges the gap between our warm yellows and the deeper toned Cadmium and Pyrrole oranges."
Pigment - Disazo/ Pyrrole, PY14/PO73
Vehicle - Linseed Oil, Consistency - Stiff