Review: 150 Million Candlepower Militay Xenon Arc Battlefield Illuminator (AN/VSS-3A)

Yeah, I know it is extremely tedious and in the end it might not even work. That is why I am not even looking at this way, anyway I am not so hardcore.

I actually have a HP R5500 UPS which is not in use, coz we purchased extra by accident. Along with 4 ERMs (external batteries, the internal ones in the UPS lets you rip full power for just 5 mins)....all in the company, not used at all. Could easily power the darn made in china searchlight (really plug and play) and have mobility.

http://h18000.www1.hp.com/products/servers/proliantstorage/power-protection/rackups/r5500xr/index.html

Actually you don't need carbon arcs. Nowadays the smaller xenons can operate in groups with DMX, like i mentioned in another thread which was deployed on our National Day. But probably very tedious to setup and calibrate to operate as a "single unit" so as to point at a few particular spots. But then you get disco modes. Sealed

http://www.youtube.com/watch?v=aySFA_KAw_k (the lights are actually brighter, the scene is underexposed)

I didn't manage to search youtube for a cloud pointing video for that, but a few weeks ago I did see it able to light up some pretty high level clouds few kilometres up when they are all programmed to point at 1 particular spot, the wispy kind not those low-mid level 1-2km stuff which is easy.

Wow, that officially takes the cake for most impressive DIY project. Awesome. :)

2100

Thanks for the video. Singapore has a very beautiful skyline at night. Synchronized advertising with combined searchlight arrays have probably been around for 20+ years in the US. Although impressive in localized areas for putting on dazzling downtown shows, even when culminated they still dont have nearly the sheer range of the old ge sperry carbon arcs. Setup and maintenance is a chore but it was something Id have enjoyed doing at the time. I cleaned a mirror and lens on one while at a circus and it was no more difficult than cleaning a large window. I think the operator thought I was crazy for asking but I needed to know for myself. The carbon rods are self feeding and it does its job well. The largest part of maintenance was keeping the old generator engine going.

I remember many years ago being a computer operator working in the basement of a massive corporate data center. We tended an IBM 3090 MVS mainframe and thousands of square feet in peripherals and communications equipment. The UPS room consisted of 10,000 lead acid batteries larger than car batteries and provided the center with 50 minutes of standby, at which time a diesel engine & generator that stood 2 stories tall would kick in to supply a constant load. My crew had the honors of performing the hardware diagnostic tests, including transferring full power to the UPS every month. Id have to blame them for making me the gadget freak that I am. Today, Im on the applications side and enjoy clients with deep pockets that depreciate their hardware and replace it every four years.

Oxy, thanks! Construction of that project nearly became my life's work for about 2 years.

Haha....yeah I think those big searchlights just caught on big time last year over here. The local astronomers are complaining though! :D

I mean i am aware of advertising searchlights being used here for quite long as I do photography and they do use them for product launches/opening of pubs indoors and outdoors etc...but just not very big ones as in maybe a couplle of 2-3kW rented from the event company that's about it. What they are limited by is not the $$ or size, but rather the electrical feed, ie 240V 20A. This affects the sound as well, either that or you get a lot of 13-20A circuits and extensions.

The 1.2kW "small moving head" disco type ones are popular because they do pack a punch and are very versatile to deploy in all sorts of jobs, hey no sweat just plug 2 to a 240 13A socket here in a regular hotel ballroom, lay your control cables and you are ready to Rock n Roll. Just that it is like a fat 10 deg beamwidth, similar to what you get from a XM-L with a 40mm reflector, hence a 1kW XM-L. LOL! Definitely not to the scale that you see at Las Vegas. I hope it is not insensitive for me to say, but the 9/11 "Tribute in Light" is impressive as well. That 2011 National Parade was probably the biggest searchlight show that was ever put up here. They had to use a whole farm of gensets to power them, no joke.

http://www.youtube.com/watch?v=CU_qK-XvTwQ&feature=related (yeah I know, the hotspot is huge, so lux is not there, but the ones i have seen last week is setup to add up to be much tighter and brighter hotspot)

OT and you probably have seen it on youtube, but for the benefit of others.... Carbon arc searchlights http://www.youtube.com/watch?v=3qDc1MIKnMo

http://www.youtube.com/watch?v=-zqLAin9HHs&feature=related

We will never get them here, because trailers are not exactly allowed here on the roads, i mean not for ordinary citizens.

Each 60" Carbon Arc is probably 2 billion CP max if i remember correctly, and of about 12kW. Those Made-in-China big ones can go up to 10kW from what I see on alibaba (they claim 15kW though), but you can never be sure of the mirro reflector/ballast/bulb specs, read cheap ass MIC bulbs vs expensive GE/Philips/Ushio bulbs. But anyway the biggest here on Francis searchlights it is Polaris/Stardrift/Moonraker http://www.francis.co.uk/_includes/docs/pdf/datasheets/__polaris-moonraker.pdf

7kW, 1.5 deg, 10 lux at 10km. 28" aperture and 25" mirror. So that means 1 billion CP. Exact cumulation is very difficult of course, this is not an exact science setup like those 600 concave mirrors trying to melt 1kg of steel in 1 second hotter-than-the-sun stuff you see on Discovery channel. LOL! I think about 50pcs of those 5-10kW individual lights, maybe not as big and bad ass and high performing / collimated as the Francis biggest ones, but still easily packs a bigger punch than a single carbon arc. Of course it is an absolutely unfair comparison, 50 vs 1 and extremely large-scale commercial vs personal hobby, and nobody is preventing one from getting 2 or 3 carbon arcs. LOL! But I think it has never been done before now, though during WWII it'd have been a usual sight! (ie WOW!)

The good thing about Carbon arcs vs the regular HIDs that we come across is - carbon arc lives! The sound and jumping arc.

Interesting experience on your mainframe/DC and UPS infra. Yeah I have been to the genset room and battery room before, but just as a guest as I am not directly in charge of operations. 10,000 SLAs is WOW, hehe.... I actually tried to count and gave up, just a rough estimated I guess they have about 150 to 200 x 2V cells on each rack and about 12 racks. They do that for both IT as well as telephone switches, as I work in the biggest telco in this part of the world. They don't pay too well though, hey what is new? :D

They use bigger gen sets in the Air Force/Army though....

BTW, you met BVH/ShortArc, and those guys in CPF before? (or are you guys too far apart in USA)

Hey I found a cool site! : http://ancientskyscraper.com/85601.html

http://www.victorysearchlights.com/victory4.html

Light Output:
The average multi-beam has 2 or 4 Xenon lights, but each of the lamps are only 2KW to 4KW in size. Beam output is 208 to 332 million candle power for each lamp.
Our Carbon Arc light output is 12KW at 800 million candle power

A few interesting facts about the original WWII GE Sperry carbon arcs:

Searchlights were produced for military use from 1932 to 1944 at a cost of $60,000 each!

Lamp Type: Carbon Arc (no light bulb!)

Candle Power: 800 Million

Effective Beam width: 5' plus

Effective Beam length: 5.6 miles

Effective Beam visibility: 28~35 miles

Generator Power: 15 KWV nominal - 16.7 KWV max. (15,000~16,700 watts D.C.)

Powered By: Inline 6 cyl. "Hercules"
Flathead Engine

Generator Engine Fuel: Gasoline (can also be run using Kerosene or Gasohol)

Combined Weight: 6,000 pounds (3 tons, or the weight of 3 Ford Mustangs combined!)

The beam is made by 2 carbon rods, one positive and one negative, arching within the focal point of a 60 inch parabolic mirror. As the rods "burn" they are automatically fed into the light. The rods last approximately 2 hours and are then replaced.

The flame that is visible during the lights operation, is not actually the source of the light, rather, it is a by-product, produced as a result of the electricity arcing between the 2 rods.

The flame is the rod slowly burning away as it is fed into the light. The arc draws 150 amps continuously at 78 volts and burns at over 3,000 degrees Fahrenheit. The power is supplied by the D.C. generator which was designed specifically for this purpose.

More interesting facts from this reputable source here.

I would be very surprised if any single modern short arc searchlight could deliver anything close to 20% of the Sperry's performance as measured in actual candlepower in direct comparable tests (amount of light on target at maximum range). Im not talking about bloated Chinese advertising but decisisive military proven field studies. Just as the most powerful SST-90 flashlights probably deliver only about 1:10,000 the candlepower of a properly powered VS-3, the Sperry is likley at least 5,000 times more powerful than the VS3.

You're right, they are a lot of fun to watch in operation. The electrical sizzling of carbon being burned, the small traces of smoke rising and the blue arc that can be viewed from the sides. Its all quite exciting and appeals to my gadget oriented nature.

Luckily, Ive only been a member of CPF for the past few years. Had I followed the advice of others from that forum, my VS3 project likely wouldnt have been as safe, robust or reliable as it had turned out, nor would I have met the proper collectors of military hardware that are authoritarians on the subject to provide factual installation guidance with ZERO conjecture.

Problem is that i have seen the 5-10kW units, but not the Carbon Arc.

Actually the "farm" managed to light up cirrus clouds so that is comfortably over 20000 ft, could be 30-40k ft. So seriously I don't know how bad that can be. But operated singly for these Chinese stuff, there is probably no fight of course. The 60" aperture of the carbon arc does mean something in addition to the precise mirror, this really helps to "lift" the ~ 12 lumens per watt efficiency of the carbon arc.

The Francis searchlights is actually reputable internationally, ISO certified and distributed worldwide, it is not the "CCC" that we'd come across. So I tend to believe their figures to be quite belivable. As you said they are used commercially, a quick check shows that they are used on big commercial freighters, Defence and Law Enforcement like Prisons etc. I know what are you talking about the military and all that stuff (I was in the Air Force before), but there is still a limit.

Pls don't get me wrong bro, I know how those Chinese stuff work and how reliable they are with my HIDs. But they still work based on the technology, and even if clobbered together "haphazardly", they still get the goods delivered. 60" aperture + precision mirror is great, but still < incandescent efficiency of ~12 lm/W means that the 12kW power is cut down a lot in terms of sheer lumens even if you manage to collect and focus that in a crazy manner. Of course I know your passion and many other collectors the passion is really is in this and really look forward one day in which someone can do a direct A-B shoot out between those lights. There is no mistake what a farm of those can do....the comparison is just "totally unfair" of course, may I stress again. :)

PS, how long is the arc length of the 60" carbon arc? This info is very useful to me as well. Again may I stress, i am just interested to know all these stuff for knowledge, am sure everyone is. :) Eg, for hifi, i like my LP and single ended tubes, there are some NOS tubes which i really like, and i also like my pro-audio stuff. I have 2 pro subs from this company : do check out the youtube link, it is quite interesting as the claim is "worlds largest subwoofer" (pls don't that that literally, of course) and yes they do deal with the military doing other projects like infrasonic Sonic Boom generators. Of course the commercial offerings are not like that, but the tech (bass horn) is there and not new http://www.youtube.com/watch?v=Zbf3bzpgml8

Way cool! Will never happen here though...sigh.

And lastly, a 20kW Xenon arc, 1.3 billion CP

http://www.brettpeabody.com/

Interesting, I know some short arcs have low lumens efficacy (ie the Maxabeam) but its lower than i thought for these high-end ones, it is 40 lumens per watt.

http://www.thehenryford.org/imax/about.aspx

the lamp
The lamphouse on top of the IMAX projector utilizes two 15,000-watt liquid-cooled, short-arc xenon lamps. The lamps weigh 10 pounds each, and are nearly two feet in length. Costing more than $6,000 each, the lamps have a life expectancy of only about 1,200 hours of operation and are replaced 4 times per year. Because of the extreme high-pressure xenon gas inside the quartz glass envelope of the lamp, projectionists must wear ballistic safety gear when changing out a lamp. If dropped, the xenon lamp would explode with the destructive force of a hand grenade.

The average luminance of one of these xenon lamps is approximately 1.6 billion candles per square yard--about equal to that of the Sun as viewed from the Earth's surface! The lamp has a light output of approximately 600,000 lumens. NASA uses this same type of lamp at the Kennedy Space Center to illuminate the Space Shuttle at night on the launching pad.

During normal operation, the clear quartz glass envelope of the lamp has a surface temperature of about 1,300 degrees. To prevent the lamp from overheating, it has coolant "jackets" that allow cool distilled water to be pumped around the electrodes at the flow rate of 8 gallons per minute and a pressure rate of 100 psi. In addition, an exhaust fan removes 1,200 cubic feet of air per minute from the lamphouse. The xenon lamps operate at 37.5 volts DC, and 400 amperes of current.

Let's say you're in San Diego, California and you want to roast marshmallows in nearby San Rafael................

Small blue switch on the back for " Low Power Mode " gives 18 Lumens of light for 46.7 years on a single charge.

Handy " Diffuser Attachment " ( not included ) makes a perfect " Night Reading Light " for the entire State of Delaware.

Amazing light and the "mouse over" picture and giant Laser effect of the beam are very impressive.

Haha, thanks for the laughs. The project was initially an exercise in futility while trying to adapt it for marine use. Once completed, the light made an amazing boat that much more fun & useful. We were the only ones on the California Delta able to power ahead at full throttle after dark without having to worry about smashing into anything... especially partially submerged debris, such as logs, etc. Interestingly, it also did a great job at illuminating deep submerged objects through murky water. You could actually see at least 10 feet into the murky water way out in front while the boat was at speed. If anything, that was actually more impressive than the sheer beam distance through night air.

I used to work in San Rafael and had a large sail boat at Pier 39 in San Fransisco.

Late to the party pedantry...

105mm projectile...remember we're talking about an M-60 series with an M68 main gun. The 120mm gun didn't enter the picture until the M1A1 in the mid 80's.

Thank you, and corrected. As I wrote this, I was still wishing I had thermal imaging instead of a xenon arc. I have a friend thats a tank platoon leader for the M1A2 bunch. I get to pop off a few night time practice rounds in Feb. Im hoping the range has some descent fun targets when I get my try.

Can’t believe I missed this awesome thread, here’s a nerco bump. :party:

Im just glad you never got one. The darn thing would be turned into a 1kW laser and make the folks at Lawrence Livermore green with envy. :smiley:

Hi…

i am looking for a battelfield search light …something very similar to what u have posted. please chat with me on nafees.iaf@gmail.com and help me buy this light. i am looking for a long range spot like which can make a spot covering the distance of 3 Kilometers.

Request to give your mail id so that i can communicate with you regarding the same.

Thank you…

Nikki
:slight_smile:

Hi Nikki. Welcome to BLF! These are the only reasonably priced 1kW military searchlights that I am aware of at this time. You can contact the seller if you questions. Good luck!
http://www.ebay.com/itm/271606524719?\_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Kind of impressive.

Everybody needs a hobby. Yours is interdiction on the Sac waterways!

Xenon arc is about the only thing that illuminates semi submerged objects while at speed. Maybe that’s why we were usually the only boat “on plane” after the sun went down. Nice sail boat. Is that yours? I used to own a Morgan Islander 51’ in SF Bay.

Next time your out at night, get us a couple of beamshots.