Thanks to those few with constructive comments.
Seems like I'll have to spend more time finding suitable lights myself rather than relying on folks here. It means more time searching light manufacturers light offerings and then finding (where available) reviews of interesting lights.
Anyway, I've found three lights so far which appear to meet my requirements. Neither are Convoy nor Emisar.
We are happy for you.
I have a great recommendation, but it's a Convoy, so that's out. 
Exactly!
OK, here’s my last suggestion: ZebraLight SC700Fd (21700 battery)
I googled the MS03 to get an idea of what you’re looking for so I could suggest some lights which might compete.
I can’t find the specifications you want (beam angle or lux at lower modes) on the Imalent website… where did you find these?
Some questions which might help narrow the field:
1) What do you mean by 50 degree beam angle? is this Full Width at Half Maximum angle or does it include the ‘spill’ of the beam?
2) What do you mean by 30m of throw? ANSI standard uses 0.25lux on target which is generally considered to be quite low. Is this distance just for the center of the beam or do you want the full ‘50 degree beam angle’ to illuminate to 0.25 lux at 30m?
No need to be like that, the people here know what they are talking about and are only trying to help
Click the Technical Data tab at the Imalent website for specifications.
Beam Angle refers to the angle defined where the beam luminous intensity (candelas) has fallen off to 50% of its maximum value. Maximum value is along the center line of the beam. You can Google "beam angle" for more details.
Yes, the throw of 30 meters (as a minimum requirement here) allows for the fact that the throw is determined when the Illuminance (Lux) drops down to 0.25 Lux.
Thank you.
Some people seem to know what they are talking about, but others apparently do not fully understand the requirements. Yes, some comments have been helpful and were appreciated.
[quote=meeshu]
[quote=merlot]
ansi doesn’t currently and has never gotten into beam angles. Some manufacturers will reference beam angles as to the hotspot and the overall spill. I don’t believe the specs that you seek are published by any manufacturers again because of the way ansi originally drew up criteria. And after the “ansi/plato 2019” most are not playing along. If you find something even remotely close please share. Re Manufacturer specs
Well, wouldn’t any SST-40 or even the older XP-L V5 PD35/32s work then that are still on Amazon? They’d be much floodier.
So, you have to research your own purchase? What an inconvenience.
The problem is all the nearly mutually exclusive “requirements” that were set forth right from the beginning.
Okay, so you want floody, but also lots of throw. So you’re necessarily talking a HUGE number of lumens to do that.
Floody means all those lemons are going to be spread allllllllllll over a wide area, putting intensity down into the shiiter. To make up for the need for throw, you’ll then need to ramp up all those lemons proportionately.
But it has to be a single cell organism and be small enough to fit into a pocket. Okay, so burst-mode turbo for… what?… 10sec before it turns into a curling-iron and needs to be turned down manually or it turns itself down?
And then, just from a practical matter, if you take all that and magically make it work, to get ¼ lux on the target way way way down there in the blackground, and your foreground will be so blindingly bright that you’ll never even be able to make out what’s down there. Just picture those beamshots in the woods where nearby trees and the foreground are lit up like daytime, but what’s down the hole is still black.
But hey, what do we know?
Just get a zoomie like a Cometa or Z1 and zoom back’n’forth. Best of both worlds…
Too bad we’re hung up on mfg specs, as a D4S with boost and 519a (5700k de-domed) or XP-L Hi 4000k is probably the actual solution here.
Something smaller would work if not for needing to run for several hours at a time.
I posted here to save some time having to do my all own research as there are literally scores of lights available. Others who might have had some experience with suitable lights could save me some time.
I had already researched a number of lights prior to this topic and am still looking at other possible lights.
I use manufacturer specifications as a guide/starting point and then look for associated reviews to confirm performance.
At this time I have one light as a strong contender with a couple of other lights as alternatives.
Well, I’d recommend the Convoy M21B GT-FC40 with that new LG M58T cell if you can somehow get it.
OP doing “research” here already from 2012, but research didn’t come to Convoy or Emisar lights yet… 
Holy hell! 10 years. I feel played. Haha. Stop messing with us, Meeshu, we know you have a D4S already… 
[quote=meeshu]
Not seeing the logic. It is nice to have manufacturers specs as a starting point. But the fact that there aren’t any available, but people you asked for advice are recommending something, and reviews are out there… hardly seems to warrant completely discounting those options.
Advice from people using a light along with reviews from trusted reviewers with hard numbers and beam shots, is without a doubt better for making a decision than marketing numbers from the manufacturer. Especially when they don’t even document how they got the numbers.
You have a set of requirements that are hard, if not impossible, to attain from a single light. You are making your life more difficult by writing off many excellent lights based on the absence of published specs. But your choice… A bit of self imposed agony IMHO.
Anyway, I wish you luck.