Horav Yisroel Belsky Shlita (Taamei Haminhagim 606, see ibid:607 for an additional reason) says the reason is as a remembrance of the fire that surrounded Rav Shimon Bar Yochai while he was in the cave.
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Horav Yisroel Belsky Shlita (Taamei Haminhagim 606, see ibid:607 for an additional reason) says the reason is as a remembrance of the fire that surrounded Rav Shimon Bar Yochai while he was in the cave.