The title says it all really..
Doing research for the Mag100 and trying to find cells with some more oopmh than the CBP 1650s i discovered some real winners.. The GP2000 4/5A cell. I also discovered that they can JUST BARELY and i mean with only possibly 1mm to spare.. fit 3x3 in a 2D 3-bore host..
I've been soo sick for about 7 weeks that i did not get much of anything done in the lab, but about 1 week ago i finally got my battery pack assembled to try out this solution.
HOLY CRAP it works beyond words awesome! Ok.. so these batteries don't even think the light is on since it's 'only' pulling 3.4A.. i have measured Vbat at over 12.3V under load.. and i've measured over 11V after 25minutes of operation.. means.. that my voltage setting of 11.1V is maintained for at least 80% of the runtime of the light.. runtime is estimated about 30-35 minutes.. i didn't time it.. but mathematically it's 35 minutes to the posted graph of useful output from CBP, not the '2000' rating.. I figure that'll get me a bit over 30 minutes before the low-volt cutout kicks in.
Right now i have a smooth reflector but a stippled bulb (frosted).. and the combo works really nice to have a very nice smooth beam but with tons of throw.. i've measured 40k lux, which is about what i get with a typical Mag85 that gets only 10.7-10.8V to the lamp.
So.. of course the light need a regulator.. and the hotdriver does a perfect job of just holding back that extra voltage.. the average efficiency is maybe 95% or so.. but 90% initially when the batteries are fully charged.
The light is a total winner.. It's amazing to see the very best Mag85 performance of ever, and in a 2D host. Sadly it's so blown away by the Mag100 and USL that i'm forever ruined in my ability to judge how bright it is.. mathematically and comparatively (to other Mag85s and lessor lights like the M6 (only in output folks no freakin out on me here)..
Here are a couple beamshots to showcase the light:
M6 for comparative reference
M66 (1166 lamp at 12.45V.. 900/585L).
M85 (1185 @ 11.1V.. 1360/880L).. just blows the others away.
Notice the amount of light lighting up the area outside the spot.. the M85 is a light monster.. Absolutely stunning... another example of its output:
In this picture, the garage is about 60' away.
There is a nice difference in that extra 100 Lumen of light i get with the M85 compared to a typical 3D hosted 1185 lamp.. not to mention that the output is non-dimming. Only the last minute or two you can notice it's starting to dim before it shuts off.. i'm thrilled with the overall package solution.
I have too many things on too many burners to work out a turnkey solution for the M85, but i might pass that off to a buddy that can do it sooner than i can. The 'forumulator' says the selling price would have to be between $210 and $266 to be profitable, but my estimates show that a DIY could probably build this light for closer to $150-160, and i'm all for the DIYer, i will be selling the hotdriver at all levels of complete including at least one nutty guy that wants to put on the SMDs himself (i'll include some spare resistors for the ones that will end up in the carpet!).
So.. though definitely more evolutionary than revolutionary, the 'M85' is quite a nice improvement from the legendary Mag85.. the "M" nomenclature i made up to represent that like the "M66" which is the smallest yet higher performing 1166 based light than any others.. the M85 is likewise the smallest yet higher performing 1185 based light than any others. (i can dial the output up as high as the lamp can take.. i might do an experiment and see if i can get the lumen output up to an even 1000).
That re-rates the lamp to a mere 5.7hr lamp life, but that sounds fun for experimentation sake.. that particular regulator takes about 400-500msec to get to full power so it's definitely the softest starter i have. (fun to see ramp up too). It only takes 11.5V to get 1000L out the front with the 1185 lamp.. and these cells would absolutely output that much for maybe 1/3 the runtime. I think i'm quite happy with the 880L on my standard config. though.
So.. one more killer light from the skunkworks at wynnbright. It's quite a sight to see how cram packed that battery compartment is with the 9x4/5A size batteries in it.. amazing that they fit... the bottom PCB of the battery pack actually comes about 2mm past the first threads!
I think this might be my favorite light to recommend that people would copy or buy (if we can get a turnkey solution going). I love the M66 'cause it' so cute and small.. but I've tried since august to find a better bang-for-buck lamp than the 1185 and just rolling snake eyes.. so i figured.. i have to come up with the very best 1185 solution possible, and homed in on this one.. it's an absolute stunner.. and a lot of people will have the ability to duplicate this solution in the very near future.. I'm using a litho123 commissioned Fivemega 2D-3Bore host, the hotdriver and a battery pack i made myself from 2 circles of PCB i bought at radio shack and a length of 3-48 threaded rod. I made the nuts myself from some 8mm disks of copper and a tap i made myself from a piece of the same threaded rod. (it's very hard to find 3-48 nuts!).
I'm looking for 2mm threaded rod, or likely i will make my own with some copper wire and a die.. to make the battery holders. The resistance on the pack is extremely low, since the 'traces' are effectively about 1cm wide.. and the batteries are in series without the use of magnet spacers (i had to trim the labels on the cells to get them to contact nicely.. they are really flat-top.. pretty much indented top and bottom).
So.. comments, anybody?