HID vs multi-XM-L

For example, let's say I'm replacing a DRY with an HID flashlight at least comparable in size to a 4D to 6D Maglite (I just mean no ridiculous proportions). What kind of wattage am I looking at to beat out the DRY? Will I still get enough usable flood? I'm a complete noob when it comes to HID flashlights.

Also, what are the differences between a multi-cell lithium-ion light in series versus an HID flashlight in regards to safety? This is mainly what piqued my interest.

35W and higher will beat DRY easily (but don't expect any decent throw with reflector the size of Maglite head).

I've got a 28w HID (Palight BG-002), and a CW Dry.
The HID absolutely blows the Dry away as far as throw is concerned. It has a 57mm dia reflector.

I actually meant over all size in regards to the Maglite comparison. I'm curious about a healthy compromise between throw and flood. I don't think I'd need a reflector size larger than the X9. Because my dad uses this type of output in short burts (spotting critters) the HID is still a viable option, if not more so than something like the DRY. That's in terms of battery consumption anyway. Does the bulb handle short bursts well enough over time?