It is probably Halpe filda.
Definitely not H. arcuata.


H. arcuata.
FW spots 2 & 3 wide & almost fully overlapping.
FW without cellspot.
Subapical spots 2.
http://yutaka.it-n.jp/hes/91350001.html


Halpe filda.
FW almost always without a cellspot.
Subapical spots 2 or 3.
FW spots 2 & 3 with only partial overlap.


Two others formerly included under H. homolea, H. aucma & molta have a prominent FW cellspot.

All three , H. fllda, aucma & molta can be seen in the link below ,Colour Plate 1.
https://www.zobodat.at/pdf/Neue-Ento..._0207-0263.pdf


TL Seow: Cheers.