Brian:
Weight: H30 wins ~24 gm vs. 27.6 gm
Batteries: 123's are nice, and you already own them.
Hot spot — depends on your needs. The H31 hot spot is an advantage for many, and a reason to "upgrade" to it. It means the H31 has decent throw (a first for Zebralight headlamps), while the H30 is a flood. The H31 may well be better for any night time hiking you end up doing (they say the spill is just about right, too). The weight is close enough that you could easily choose on flood vs. throw alone.
I also prefer the more even illumination, as it'll probably get used for tent reading as much as anything else.
This may not be a problem. It has been mentioned in some CPF thread — the take is that the spot is wide enough for reading.
Q1: Would anyone care to comment on it's suitability for close up work or reading? I'm worried that the hot spot might be a bit too tight. Any volunteers for a little night-time read on the toilet?
Q2: Is the hot spot too narrow or bright for up-close tasks like reading?
A: I just tried with a printout on plain white paper, on both low modes and on the lower medium I can read quite well, the hotspot just fills the width of the paper. … Nevertheless a floody version would still be better at that task I guess…
Brightness — once again goes to what you will use the light for. The H31 has more settings than the H30 (and a decent UI to access them, along with sticky low and medium settings), including:
*) One of the medium settings is 43 lumens (12 hours) — a value that some at BPL like for rough trails and off-trail use. The H30 has no equivalent.
*) The H31 has a "moonlight" setting 0.5 lumens (21 days) that many think is enough for tent use, reading, and much in-camp. The H30 has no equivalent.
So the argument for the H31 seems to be throw vs. flood and more flexible brightness settings. Up to you whether you care about those things. To me, if you do care, they would outweigh the 3.6 gram difference in weight.
–MV
P.S. a late-breaking relevant question was posted at CPF:
Q1: Can someone who has both the H501 and H31 XP-G comment on the usefulness of the XP-G beam compared to the all-flood beam of the H501 for up-close tasks such as reading, cooking, doing things within arm reach? The H501 is the perfect light for these tasks. I am just wondering if the XP-G with its big hot spot can retain some of the arm length usefulness the H501 has. Thanks.
Q2: Seems I'm not alone in wondering about the close up usefulness of the new H31 and H31w. I don't mind a hotspot in the slightest BUT as far as I'm concerned if it can't be used usefully for closeup work, for me at least, there's no point.
A: Just use the lights on a lower level for up-close work.
I've read in bed, washed dishes, and other up-close stuff with absolutely no problems while using BOTH the H31 & H31w.
I have the H60w & H30 so I have compared it to them as well.
At this point I think a lot of the concerns you guys have are not an issue unless you are the most picky person out there.
I can get stuff about 8 inches from my face and don't have an issue with the hot-spot being to bright and there is plenty of spill beam to make it useful.