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Enlightened
HI is the emitter type. It means "High Intensity" and uses a factory flat dome similar to a de-domed emitter as apposed to a traditional rounded dome. This increases throw at the expense of a bit of lumens.
The HI sounds like what you want. The new Plus uses the XHP50.2 emitter. It is a larger emitter then the XHP35 HI and has a traditional dome. Both of these things will increase hotspot size and lower throw. But, it has a significantly higher output which will slightly compensate throw wise through brute force so to speak.
Thank you for the explanation, Tachead.