There are a number of posts relating to the questionable authorship of the Zohar ('traditionally' attributed to Shimon bar Yochai, see this wiki for examples, and references at the end). Some say that the fires that are lit symbolically relate to the mystical revelation of Torah in to the world (when Rabbi Shimon bar Yochai, came out of the cave with 'fire' in his eyes).
Are there any implications for the minhagim of Lag Ba'Omer for those who don't hold Shimon bar Yochai to be the author of the Zohar?
- "Did Rashbi write the Zohar?" - Mi Yodeya
- Rav Ovadya Yosef on the Zohar, here
- Rav Yaakov Emden, on the authorship of the Zohar, here
- 'An analysis of the authenticity of the Zohar', Rav Chareidi, here