Light is an electro-magnetic wave. E is the electric field vector, and B is the magnetic field vector of the EM wave. For electromagnetic waves E and B are always perpendicular to each other and perpendicular to the direction of propagation. The direction of propagation is the direction of E x B.

The electric field vector and the magnetic field vector are normally considered to be in phase. For every cycle there are two null points. Could it be that a photon is that part of the electro-magnetic wave between two null points? If so, there would be two of them per wavelength. Does this explain why light propagates in discreet packets and exhibits a wave like/point like duality?

The electric field vector and the magnetic field vector are normally considered to be in phase. There is a problem with this view of them being in phase. At the null points of the wave, energy would appear not to be conserved. To conserve energy the two components of the wave would need to be either (1) 180 deg. out of phase, or, (2) in some sense the wave needs to be travelling in both directions of time simultaneously.

(1) If the two components of the wave are 180 deg. out of phase then it is difficult to explain why light comes in discrete packets and why it has a wavelike/point like duality.

(2) The simplest explanation therefore is that photons propagate in both directions of time simultaneously. They do that by propagating backward in time with the same time dilation factor that time flows forward.

This is not the same as photons not experiencing time although the effect is similar. Neither is it saying that they actually travel backward in time. They only travel backward in time with the same dilation factor that time flows forward.

Light is an electro-magnetic wave. Electromagnetic waves can have any wavelength λ or frequency f as long as λf = c.

If you consider photons as not experiencing time or distance then both wavelength and frequency become meaningless.

If you consider photons as traveling backward in time with the same time dilation factor that time progresses forward then they (photons) have both frequency and wavelength.