Hi Dave:
LEDs are used on many cell phone cameras in just that way. The data
sheets for the LEDs have the pulse use specs.
At: http://www.sd36.bc.ca/sulhts/departments/elx/p/elec.html
scroll down to the "Boy Scout Motor" and notice a common LED held by two
wires that's being used as a strobe light.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Dave Martindale wrote:
Hmm. Has anyone built a strobe light using LEDs instead of a xenon
flash tube? I can see the appeal of building something that doesn't
need high voltage to fire or trigger the tube. Yes, you probably
couldn't get as much light as a big Xenon tube, but there are
applications where you don't need to illuminate a large area. (Recent
example of where I wished I had a stroboscope: looking at the balance
wheel of a pocket watch).
How high can you push the drive current of a LED if the pulse is
short? Of course you have to keep the average dissipation below what
the device is rated for, but there must be a peak current limit too.
Dave
On 30/01/2010 01:17, Robert Atkinson wrote:
Hi,I'm late to the thread (as usual), but have looked at these LED's
in the past. It was for a biotech imaging application. There are two
types, a red/green/blue cluster or a blue / near UV LED with a white
phosphor. These phosphors seem to have a fairly continuous spectrum,
at least compared to fluorescent lamps and HID lamps. What surprised
me was the speed. We had a strobe application for which a xenon
strobe was proposed. I tried LED's (our optics "expert" said even
normal LED's would not be fast enough). I knew normal LED's are fast
enough but was unsure about the phosphor types. To my surprise they
where faster than the xenon tube! They were faster than my detector.
This has has an impact on the mill illumination in that you can get
strobe effects that could cause you to think the spindle was
stationary when it was not. This is more of a problem in a noisy
environment than a home shop with only one machine running. Robert
G8RPI.
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