Searching \ for '[EE]:: Xenon flash tube design' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: piclist.org/techref/mems.htm?key=flash
Search entire site for: ': Xenon flash tube design'.

Exact match. Not showing close matches.
PICList Thread
'[EE]:: Xenon flash tube design'
2012\07\29@232954 by RussellMc

face picon face
Superb design guidelines for driving Xenon flash tubes. Based on tube's
visibly observable, measured or testable parameters when  no data is
available.

         http://donklipstein.com/xeguide.html


Very useful Xenon Technologies "One stop Xenon Flash Solutions for Cameras"
Combination application note, deign guide and data sheet. 19 page PDF.

Listed tubes range from 1-2 Joule mobile phone tubes, through 4-11 Joule
"digital camera tubes", 16-21 J "DSLR Camera" tubes to 14-70 J "Xenon flash
tubes".
The 69J tubes have 3.6 mm OD and   42 mm between electrode ends. Energy is
about 15% of the energy of a "38 special"'s muzzle energy and the tube is
rated at 15 discharges/second.


http://www.xenon-technologies.com/userfiles/files/XEN003066YC_ProductCat_05oct10.pdf



        Russell McMaho

2012\07\30@073107 by Djula Djarmati

flavicon
On 30.7.2012 5:29, RussellMc wrote:
> Superb design guidelines for driving Xenon flash tubes. Based on tube's
> visibly observable, measured or testable parameters when  no data is
> available.
>
>            http://donklipstein.com/xeguide.html
>
>
> Very useful Xenon Technologies "One stop Xenon Flash Solutions for Cameras"
> Combination application note, deign guide and data sheet. 19 page PDF.
>
> Listed tubes range from 1-2 Joule mobile phone tubes, through 4-11 Joule
> "digital camera tubes", 16-21 J "DSLR Camera" tubes to 14-70 J "Xenon flash
> tubes".
> The 69J tubes have 3.6 mm OD and   42 mm between electrode ends. Energy is
> about 15% of the energy of a "38 special"'s muzzle energy and the tube is
> rated at 15 discharges/second.

Isn't this dangerous for the eyes if you are close, it is very dark and you look directly at the bulb?

Djula

>
>
> http://www.xenon-technologies.com/userfiles/files/XEN003066YC_ProductCat_05oct10.pdf
>
>
>
>           Russell McMahon

2012\07\30@082335 by RussellMc

face picon face
> > The 69J tubes have 3.6 mm OD and   42 mm between electrode ends. Energy
> > is about 15% of the energy of a "38 special"'s muzzle energy and the tube
> > is  rated at 15 discharges/second.

Djula said:
> Isn't this dangerous for the eyes if you are close, it is very dark and
> you look directly at the bulb?

1. Yes.

2. Not as dangerous as a 38 Special in the same circumstances.

I have a guide number 56 flash that I use with my DSLRs. People tend
to find it "too bright" if used directly at a range of a few metres.
The 69J tube is probably about 4X as powerful.
If it was fired at the rate of 15 times per second it would rapidly
temporarily reduce the seeing ability to zero of any person viewing it
from a few metres away. Even when light of this intensity stops all
you get is strong after image for some seconds and then a decreasing
after image plus some vision for tens of seconds.

A 69J = 69 Ws tube fired 15 times per second requires an input of 69 x
15 =~ 1,000 Watts continuous input. That's an impressive power
handling ability.

I have two flashes which have automatic zooming to track the lens
focal length (the 56 guide number flash and a 42 guide number flash.)
If zoomed to match a say 200mm lens viewed at close range the focused
light would be proportionately brighter.

... time warp ...

I just spent several minutes staring into the guide number 42 flash
from a metre or two with fully wide and fully zoomed settings. Both
are "bright" and the zoomed appears brighter but not vastly so.
Multiple flashes at about 2 to 4 per second add to the effect but
still leave some vision immediately afterwards. It will take tens of
minutes for the after image to fade fully. Hopefully it will :-).



Russell McMaho

More... (looser matching)
- Last day of these posts
- In 2012 , 2013 only
- Today
- New search...