lighting types--what are they?

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Those are lighting levels, not types. They describe the lighting intensity in the tank, so you if certain plants have a chance at successful growth, or if they'll wither and die.

As a general guideline, 1 watt per gallon and below is low light. 1-2 watts per gallon is med/low to medium. 2-2.5wpg is medium, and 3wpg and above is high.

When you hit 2wpg, CO2 injection becomes necessary.
 
I agree with malkore deeniOz. Between 1 and 2 wpg would be medium low light. Over 2 wpg and you need CO2.
 
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