Demon Halphas is mentioned in the Goetia, in The Discoverie of Witchcraft, in The book of incantations and in Pseudomonarchia Daemonum.
Below you will find a mix of information about Halphas and hopefully it will help you to summon this spirit.
Demon Halphas: Goetia
Halphas is the 38th spirit and he is ranked as an Earl. This spirit appears in the form of a Stock- Dove. His duty is to build up towers and to furnish them with ammunition and weapons, and to send men of war to appointed places.
He commands 26 legions of spirits.
Halphas: Pseudomonarchia Daemonum
Halphas is an Earl and he speaks with a hoarse voice. He builds up towns full of ammunition and weapons. He also sends men of war to appointed places.
Halphas rules 26 legions of spirits.
Source: Johann Weyer, Pseudomonarchia Daemonum
Halphas: Daemonolatry Goetia
Summon Halphas when you have a need to gather allies and friends around you. Halphas will support you and help you to be in control when group mechanics are at play.
Wear the sigil of Halphas to be well received and respected by your surroundings.
Source: Daemonolatry Goetia by S. Connolly
Demon Halphas: when to summon him?
Halphas is ranked as an Earl. The Earls of Goetia come from the area of Qlipha Golab on the Qliphotic Tree. If you know the Tree of Life with its 10 Sephiroth, then Halphas comes from the area of Geburah.
I use the correspondences of Geburah even for Golab (the shell of Geburah):
Ruling planet: Mars
Astrological hour: Mars
Altar cloth colour: red
Candles: red, black or white (use white candles if you cannot obtain red or black candles)
Number in magick: 5 (5 candles for example)
Metal: iron (use a hammer or steel coins, because steel contains iron)
The best day to summon the Earls of Goetia is Tuesday. You can fine tune your magick by doing it during the astrological hour of Mars.
Similar demons: Goetia
Below I offer you a video about Malphas. Sabnock and Halphas are also mentioned in the video.
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