Christians of a Christian group that is known as "Local churches" or "Recovery" hold the view interpreting these seven spirits as nothing less than the Spirit of God Himself.
They make this case by putting together the following four verses:
Rev 1:4 + Rev. 4:5 + Rev. 5:6 + Zech. 4:2
In Rev. 1:4 and 5 the seven spirits that are in front of the throne of God are ranked among the Triune God – the grace is equally coming “from Him which is, and which was, and which is to come” (which is interpreted as God the Father), from “the seven spirits” (which is interpreted as the Holy Spirit), and “from Jesus Christ” (the Son):
John to the seven churches which are in Asia: Grace be unto you, and
peace, from Him which is, and which was, and which is to come; and
from the seven Spirits which are before his throne; and from Jesus
Christ, who is the faithful witness, and the first begotten of the
dead, and the prince of the kings of the earth. (Rev. 1:4-5 KJV)
In Revelation 4:5 there is another mention of the Seven Spirits of God that are identified with seven lamps likewise located in front of the throne:
And out of the throne preceded lightnings and thunders and voices: and
there were seven lamps of fire burning before the throne, which are
the seven Spirits of God. (Rev. 4:5 KJV)
It is believed that the seven Spirits of God here are the ones mentioned in Rev. 1:4.
In Rev. 5:6 there is another mention of the seven Spirits of God, which are now identified with seven eyes of the Lamb:
And I beheld, and, lo, in the midst of the throne and of the four
beasts, and in the midst of the elders, stood a Lamb as it had been
slain, having seven horns and seven eyes, which are the seven Spirits
of God sent forth into all the earth. (Rev. 5:6 KJV)
It is believed that these seven Spirits of God are the ones mentioned in Rev. 1:4 and Rev 4:5.
The fact that the seven Spirits of God are identified with Lamb’s eyes, which may be distinct from the Lamb, but are hardly separable from Him, is taken as another indication that the seven Spirits of God are nothing less than the Third Person of the Trinity, i.e. the Holy Spirit – He is also distinct from the Son, however, He is not separated from the Son.
Thus, the seven Spirits of God are interpreted as the Spirit of God.
The fact that the Spirit of God is represented here as seven spirits and as seven lamps is explained as the Spirit of God being shown here more in His functioning/work/operation, rather than in His essence. The similarity with a lampstand which is mentioned in the book of Zechariah is brought up as a supporting point:
And said unto me, What do you see? And I said, I have looked, and
behold a lampstand, all of gold, with a bowl upon the top of it, and
its seven lamps thereon (Zech. 4:2 KJV)
Though there are seven lamps on the lampstand, there is still only one golden lampstand (which is understood as a prototype of the Holy Spirit), which functions by means of seven lamps on it burning at the same time.
The fact that the seven Spirits of God are spoken of in Revelation 5:6 as the ones sent forth into all the earth is taken as another point supporting the idea of the Holy Spirit being shown here with a primary emphasis on His functioning/work/operation, rather than on His essence or nature.
The functioning of the Spirit as seven Spirits of God or as seven shining lamps is believed to be especially needed for the Church since it had entered into the dark age of degradation of the Church, which is believed to have started around the time when all the Christians of Asia turned away from apostle Paul (2 Tim. 1:15)