The phrase "actually two types of" is correct and usable in written English.
It can be used when clarifying or specifying that there are two distinct categories or classifications of something.
Example: "In the study of ecosystems, there are actually two types of biomes: terrestrial and aquatic."
Alternatives: "in fact two kinds of" or "specifically two categories of".
As shown in Figures 1 and 2, there are actually two types of spectrum holes.
But there are actually two types of GDH: the one coded by GLUD2, which is found mostly in nerve tissues, and a second type, coded by a gene called GLUD1, which is found in many different cells and performs a variety of functions.
There are actually two types of holograms in wide use today, and no, the "Tupac hologram" doesn't count.
Probing questions from Oppenheimer prompted Robert Marshak's innovative two-meson hypothesis: that there were actually two types of mesons, pions and muons.
After pouring more research and thought into the topic than I care to disclose, I've developed the theory that there are actually two types of hipsters, and they are both totally legitimate and sort of uniquely hateable.
I call these UMLACAs unidentified munitions linked to alleged chemical attacks—and there are actually two types of UMLACAs, a high explosive type and another type loaded with an unknown substance that only appears at the sites of alleged chemical attacks.
There are actually three types of attention: First, the kind that is driven by conscious, high-level concentration guided by the executive systems of the brain.
Beyond landlord insurance, there are actually seven types of insurance polices landlords should seek information about, including flood insurance and lost rent insurance.
According to science reporter and psychologist Daniel Goleman (the man who popularized the theory of emotional intelligence), there are actually three types of empathy that operate in different areas of the brain.
All bonds are two way, therefore there are actually ten types of love.
