Question about the Globes of Invulnerability.

[Greenfield]

As is my practice, I like to go straight to the horse's mouth.

Globe of Invulnerability, Lesser
Abjuration
Level: Sor/Wiz 4
Components: V, S, M
Casting Time: 1 standard action
Range: 10 ft.
Area: 10-ft.-radius spherical emanation,
centered on you
Duration: 1 round/level (D)
Saving Throw: None
Spell Resistance: No
An immobile, faintly shimmering magical sphere surrounds you and excludes all spell effects of 3rd level or lower. The area or effect of any such spells does not include the area of the lesser globe of invulnerability. Such spells fail to affect any target located within the globe. Excluded effects include spell-like abilities and spells or spell-like effects from items. However, any type of spell can be cast through or out of the magical globe. Spells of 4th level and higher are not affected by the globe, nor are spells already in effect when the globe is cast. The globe can be brought down by a targeted dispel magic spell, but not by an area dispel magic. You can leave and return to the globe without penalty.
Note that spell effects are not disrupted unless their effects enter the globe, and even then they are merely suppressed, not dispelled. For example, creatures inside the globe would still see a mirror image created by a caster outside the globe. If that caster then entered the globe, the images would wink out, to reappear when the caster exited the globe. Likewise, a caster standing in the area of a light spell would still receive sufficient illumination for vision, even though that part of the light spell’s area that lies within the globe would not be luminous.
If a given spell has more than one level depending on which character class is casting it, use the level appropriate to the caster to determine whether lesser globe of invulnerability stops it.
Material Component: A glass or crystal bead that shatters at the expiration of the spell.

Per the second bolded section, any buffs or protection spells the caster has up when the Globe goes up remain in effect.

The first section I bolded raises a different argument. It involves the term "excluded". If we read that word as meaning "keeps out", then it wouldn't apply to spells originating inside the Globe. You can't keep something out if it's already inside.

This is a fairly weak argument, but then the counter argument isn't exactly robust either.

In all cases, protections and buffs already in effect when the Globe goes up stay in effect.

Don't forget that there is an entire category of spells that will go right through, regardless of level: Instantaneous Conjurations. The Acid Splash cantrip, for example, conjures up a small amount of acid, then flings it. The acid, once conjured, isn't magical any more, it's just acid. No spell level to consider really.