The Gospel alone is the standard

To walk in the light is not something about the measure of or quality of our works but rather is about the minds conversion to reject the self-righteous way to gain acceptance with God and to accept that only way which God has declared or revealed in His word what gains the elect sinner's acceptance before God - the righteousness of Christ alone imputed. This is what it means to repent and believe.
To repent from dead works is to believe and confess the true gospel as the only grounds of acceptance before God. A sinner is made right with God by no other way than the life, death, and resurrection of Jesus Christ alone. It is by his work alone the elect sinner lives. Christ died to save his people from their sins and that he will do because he died for them and has appeased the wrath of God on their behalf.
The gospel is the only means of the elect's salvation. To walk in Christ therefore is to accept the gospel as the truth and ground of salvation. This is what James means when he says faith without works is dead. We are to walk in the truth, to build our home on the rock of his word, to therefore believe in Him as the author and finisher of the faith.