MAXABLASTER BEAMSHOTS

ShortArc

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RA,
Thanks for pointing out the original thread. I missed that one all together.
I travel to Holland several times a year, maybe next time I am over there you can point the Maxablaster upwards and I will try and locate you!
Great job on the light.
 

windstrings

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Ra said:
The arc of the mercury short-arc is in fact even smaller compared to the arc of a xenon short-arc like the one in Maxabeam!

You cannot compare the mercury-arc with an automotive HID-arc: Two totally different worlds (its confusing that both are called HID !!) The mercury-arc has up to 40 times higher surface brightness compared to automotive HID !! So the automotive HID-arc needs to have an at least 40 times bigger surface to produce the same amount of lumens as the mercury-arc.

And 40 times the surface brightness also means thats you will never ever reach the throw of mercury-arc with HID unless you use a reflector with 6 times the diametre !

The mercury is to create an ultra high pressure mercury-atmosphere (90atms)to boost the surface brightness of the arc to ultra high levels.


Regards,

Ra.

Wow.. quite facinating.. Mr. Scott! :grin2:

A very interesting bulb indeed..... Sounds like it may indeed cook your dog if you pointed it at him.. must be very very hot to be that small of an arc and still produce such lumens.

Have you tried roasting your neighbors wiener? :drool: :devil:
 

Ra

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For those who want to know:

At first even I underestimated the dangers involved with a project like this:

One day, standing in the bathroom, I noticed a severe sunburned area on my forehead, at first not knowing where that came from...I suddenly remembered testing the Mercury arc lamp a few days earlier, protecting my eyes with a type 13 welding-filter. Conclusion: The rest of my face unprotected, in about 45 seconds (!!!) I 'ultraviolated' my forehead, causing those sunburn-marks!

That even when I knew the dangers involved: The downside of superhigh surface brightness: The 100watt mercury-arc lamp relatively has the highest UV-output of all short-arcs ! Down to the most dangerous, ozone creating UV-C !!

Oh.. and yes WINDSTRINGSS, very,very hot!! After switch-off the entire bulb glows yello-hot !! Thats why there always is the danger of lampburst! If I can find the time this week I'll try to photograph the bulb just after switch-off..

Regards,

Ra.
 
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windstrings

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Ra said:
Oh.. and yes WINDSTRINGSS, very,very hot!! After switch-off the entire bulb glows yello-hot !! Thats why there always is the danger of lampburst! If I can find the time this week I'll try to photograph the bulb just after switch-off..

Regards,

Ra.
When my HID is turned off, it glows a faint "very beautiful" baby blue for several seconds.. maybe 20 or so.
 

Ra

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windstrings said:
When my HID is turned off, it glows a faint "very beautiful" baby blue for several seconds.. maybe 20 or so.


Many bulbs do that: My HID does the same thing. I have 75watt xenon short-arcs with the same blueish afterglow. However, the mercury-arc lamp does not.

The blueish afterglow is caused by the type of quartz used for the bulb: It converts part of the infrared to blue visible light. A bulb that just has been switched off still radiates a lot of IR for a period of time.


Regards,

Ra.
 
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XeRay

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windstrings said:
The arc of the HID being longer takes a few tricks to get it to jump and do its thing... very high initial voltage that would normally burn it up in a few seconds, but then the gasses heat up and do thier thing and the voltage quickly drops to normal levels for the warmup which takes 20 - 40 seconds or so for full brightness. Thats why HID cannot strobe.

We do "strobe" our Aviation HID see our website for visual display. We do 1Hz rate on each light. 1/2 second on 1/2 second off.
 

windstrings

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XeRay said:
We do "strobe" our Aviation HID see our website for visual display. We do 1Hz rate on each light. 1/2 second on 1/2 second off.

Wholly smokes.. I'm getting old.. I was reading that saying.. "I didn't write that!" LOL!.... I forgot about your Hot restrike whereas once its already hot from a normal startup, it can reignite without the usual ritual....

I stand corrected........... :twak: 'again....
 

PROFG

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Hey Ra, talk about skyshine, a wonder those observatory guys didn't send over some lumps in trenchcoats! Excellent beamshots. Thanks.
 

Ra

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Welcome to CPF PROFG,,

I know the guyzz that run the observatory, and knew they were not present that night !!

Regards,

Ra.
 

IgNITEor

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Ra.
How long is your latest run time on a single charge, and how well is your fan system doing with lamp cooling? That is a NICE tight beam with lotsa foot-candles at the other end!
 

Ra

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Hi IgNITEor, Welcome to CPF !!!

Although it would not give any problems, I never did a full runtime test.

But if I add the aprox runtimes before needing a charge, I would say little over 70 minutes total..

This lamp does not nesseseraly need cooling, but to keep things on the safe side, I mounted a fan to cool the internal space and to get rid of the ozone that builds up inside !!

The cooling works perfect: Though the internal parts will survive a mere 90 degrees centigrade, the temperature never rises above 50 degrees centigrade during operation at 22 degrees room-temperature.


Regards,

Ra.
 
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IgNITEor

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Hey that's great! Cool running xenon is happy xenon. And the simple fact that you're trying to keep the Maxablaster compact & upwardly mobile is an inspiration for all of us. Way to go!

Mega foot-candles & portability, my kinda picnic!

-Ignitor
 

get-lit

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New to this forum... Had to comment on your Maxablaster; it's the first searchlight with the big boys in a portable version, an ingenious custom build. It's one thing to work with components that accommodate functionality and safety in huge packages, but it really is an art to nearly approach that functionality and safety in such a small package. I've been excited about this sort of thing for 9 years but wife and kids come first. Back then I based a design using a Spectrolab Nightsun SX-16 helicopter searchlight I worked with years ago with a true 30 million candlepower but I'm amazed to see that something similar has been accomplished with nearly half the size of my project, and with 1/16th of the wattage and likewise seriously less power and thermal issues (and $$$). Few people understand what an amazing feat! Congratulations indead. With that small of an arc you could get away with a relatively small aperture and a relatively short focal length for a deeper reflector to grab more of that valuable light source. What focal length did you go with for that tiny .1 mm source?
 
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Ra

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Hi Get-lit,

First..

A warm welcome to these forums..

The Maxablaster indeed is one of a kind !! The perfect parabolic reflector has a focal length of 33mm, It would have been nice to have a shorter focal length, but that would give more problems with space inside the Thor-host (deeper reflector) !

But even now, when I see the inside, I cannot beleve I managed to get all that stuff in the Thor !!

Ofcource the laser-like beam is not very practical in some cases, but I am trying to design an electronic focus, but thats very dificult.. I tink you know what I'm talking about: Electronic positioning of a 0.1mm arc does have its challenges !!
Another problem I definitely have to face is the giant black hole that will form in the center of the beam when turning to flood !!! A much smaller central hole in the reflector would have been nice.

Anyway.. I hope you enjoy your stay(s) here at CPF..

Regards,

Ra.
 

get-lit

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Even while as you've indicated in another post your luminance is averaged through that .1 mm source and the Maxabeam luminance is concentrated within a smaller region of its much larger .25 mm x .5 mm source, that large of an aperture in the Maxablaster with the HBO 103 bulb is overkill, in a decent way. Theoretically though, the smaller source of the HBO 103 would punch further (laser-like) using a smaller aperture provided a quality reflector that collimates the light as precisely as the larger aperture. As the light source reaches such sizes approaching the impossible finite point source, the point of diminishing returns that larger apertures provide in accommodating greater focal length and thus larger light sources is surpassed. In a perfect world where a zero point light source is perfectly parabolically reflected, decreasing the aperture increases the concentration of collimated light with further punching power. I use the phrase punching because it accurately describes what I'm referring to without getting into the discussion of how to define throw, I'd rather define sanity. In the real world it's necessary to work around aberration with focal lengths and likewise apertures, so with tiny powerful sources it's about finding the most optimized solution between the ability to collimate the light and a highly concentrated laser-like aperture.

The Maxablaster has sparked my interest in this again. I'm considering an Osram Xenon XBO 500W/H OFR in a portable light that appears like an ordinary large flashlight. Thunderpower Li-Pos would provide clean power for a compact efficient current limiting DC/DC converter and Xenon igniter. When completed, you'd have some practicality with instant on, no ozone, still usable on boat power and modified automobile cigarette lighter plugs. Bulbs for around $600 sound expensive but 2000 hour lives equates to about $0.30/hour is actually more cost effective and 1/6th of the bulb changes and re-alignment effort than HBO 103 bulbs for $130 with 300 hours equating to $0.43/hr. Without the brilliance of that tiny HBO 103 I don't think that even the high power of the XBO 500 could have the range of the Maxablaster. Even though the Sprectrolab SX-5 Starburst using the XBO 500 only has 20 million candlepower, I'm still attracted to the idea of the amount of light the XBO 500 puts out. Considering the Maxablaster has reached the limit of range in a low powered portable light as we know it, I like the idea of a light that really knocks the socks off people within a two mile range with what appears as a regular flashlight. Just like teens racing cars, everybody wanted a sleeper car. We need a sleeper light. I'm seriously considering it... or just buy a ridiculously insane laser and be done with it? Not sure if they are even legal for simple outside fun and you can't use them for many practical purposes. No, the Maxablaster is a reminder that I still like big lights. Thanks for sharing it with everybody!
 
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Patriot

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That's truly astounding Ra! I had no idea what your short arc was capable of until this post. Really nice job on your creation.
 

Ra

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Thanks Search and Patriot,

Hopefully I can come up with more soon. But there are not many places nearby where I can take shots like that. Wait for it...

With my busy life, I did not have the time yet to costruct an electronic focus on Maxablaster. But also that will only be a matter of time..


Best regards,


Ra.
 
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