The Light of Reason, started in 1902, was a magazine edited by Allen that included inspirational writings from Allen, readers of the magazine, and other authors of the time. The magazine had a large following and groups all around England met regularly to read and discuss its contents. Allen often went on "tours", travelling to each group to speak and meet with the members. The Allen's home was also open to visit by the readers of the magazine (for a fee).

The objects of The Light of Reason was:
To teach self-control, purity of heart, and the practice of righteousness, and to help men and women to overcome sin, to live the blameless life, and find thereby the way of perfect peace.

January 1902 V. I No. 1

February 1902 V. I No. 2

March 1902 V. I No. 3

April 1902 V. I No. 4

May 1902 V. I No. 5

June 1902 V. I No. 6

July 1902 V. II No. 1

August 1902 V. II No. 2

September 1902 V. II No. 3

October 1902 V. II No. 4

November 1902 V. II No. 5

December 1902 V. II No. 6

January 1903 V. III No. 1

February 1903 V. III No. 2

March 1903 V. III No. 3

April 1903 V. III No. 4

May 1903 V. III No. 5

June 1903 V. III No. 6

July 1903 V. IV No. 7

August 1903 V. IV No. 8

September 1903 V. IV No. 9

October 1903 V. IV No. 10

January 1904 Vol. V. No. 1

February 1904 Vol. V. No. 2

March 1904 Vol. V. No. 3

April 1904 Vol. V. No. 4

May 1904 Vol. V. No. 5

June 1904 Vol. V. No. 6

July 1904 Vol. VI. No. 1

August 1904 Vol. VI. No. 2

September 1904 Vol. VI. No. 3

April 1905 Vol. VII. No. 4

June 1905 Vol. VII. No. 6

September 1905 Vol. VII. No. 9

November 1905 Vol. VII. No. 11

December 1905 Vol. VII. No. 12