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Dendera's so-called Light Bulbs rather portray two buds sprouting against each other while enclosing the geometry of the Great Pyramid. In this vivid relief, the snakes (from the passed night) of the 4th and 5th hours in the Duat exit the shafts at sunrise and sunset towards the pyramid's virtual apex.
The settings of sunrise and sunset can be seen on the left and right buds respectively; on the left is a priest of Afu-Ra supporting the bud in the same direction of Afu-Ra's path while being on top of the seed whence it germinates, and on the right is the djed pillar (without Afu-Ra's priest) representing the support of the pyramid's structure itself. Both supports, however, do unequivocally depict the sacred location of the whole scenery being in the House of Ka which is (or part of) the House of Osiris (with his throne on top of the pyramid).
The oval shape of the so-called bulbs is yet another indication of the relevancy of the process of regeneration (which takes place in the womb of the pyramid) to the Duat itself; birth takes place at sunrise and gets cycled back at sunset. Another evidence is found in a papyrus where the rising Osiris-Res is in the same pyramidal posture. And according to Budge (who quotes Bergmann), the djed pillar was also called 'The House of Sekher', which I cannot help but interpret as Seker.
The elements on the left side are carried on top of a barque signaling Afu-Ra's slanted journey in the southern shaft, whereas the right bud is sprouting on top of a horizontal floor showing probably the King's Chamber horizontal displacement from the center of the pyramid.
Another relief shows one single bud combining both of the other buds together in one single scene; the scene of the sunrise. This relief is found right across the hall on the opposite wall. It depicts Afu-Ra's travel from the northern shaft by placing the djed pillar on the boat and in front of the priest.
Another subtle difference is seen on the djed pillar's ka in which it touches the snake instead of the oval womb. It hence emphasizes the events surmounting the 5th hour (instead of the 4th). The ka is plucking the snake-like scepter to enact the scene of the 6th hour when the souls rise on their scepters and get provided with knives. And surely enough, an odd creature stands right in front of the bud with two knives in his hands.
The presence of giants on these reliefs -who carry these buds- prove my assertion that the whole scene is taking place on a huge structure (i.e. pyramid), and the presence of two priests at the center facing each other (instead of giving their backs to one another) is a vivid representation of the Equinoxes; the time when the snakes creep into and out from the shafts.
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