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Cisco Certified Network Associate (CCNA) · Cisco
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"LH refers to Long Haul. Many vendors use both of them for certain SFP modules, but they aren't a Gigabit Ethernet standard at all. 1000BASE-LX/LH SFP can achieve a distance up to 20 km over single mode fiber. Unlike that, 1000BASE-LH SFP operates a distance up to 70 km over single mode fiber." Even 1000Base-LH can reach up to 70km in distance.
im gonna go out on a limb and say this wont be on the exam lol
next stop is some cisso cert exam question (: