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A lot of these "lasers" are just LEDs without diffusing lenses, since LEDs are by nature point sources. I think one of the comments on this particular product drives that point home. ("NOT NOT NOT a laser product!") A 5W LED is nowhere near as bright or
dangerous as a 5W laser ... but watch out, just the same.</div>
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<div>Matthew Breton <br>
Design for Theater and Dance </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Stagecraft <stagecraft-bounces@theatrical.net> on behalf of PJ Veltri via Stagecraft <stagecraft@theatrical.net><br>
<b>Sent:</b> Monday, February 13, 2023 3:23 PM<br>
<b>To:</b> Stagecraft Mailing List <stagecraft@theatrical.net><br>
<b>Cc:</b> PJ Veltri <pjveltri@gmail.com><br>
<b>Subject:</b> Re: [SML] Laser projection for white stars</font>
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<div dir="ltr">The Sharelife one on Amazon appears to have a White LED source if you believe the reviews.
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<div>PJ</div>
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<div dir="ltr" class="x_gmail_attr">On Mon, Feb 13, 2023 at 2:35 PM *Hobbit* via Stagecraft <<a href="mailto:stagecraft@theatrical.net">stagecraft@theatrical.net</a>> wrote:<br>
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<blockquote class="x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); padding-left:1ex">
The other problem with "white" is that it's usually a mix of wavelengths,<br>
and if the effect-generator does *anything* with diffraction you get a<br>
spread of the wavelengths, i.e. little sets of R/G/B dots. If this is the<br>
"Sharelife" unit I managed to search up, the supposed "output" does have a<br>
pattern, and it looks like it's a *de-saturated* photo of what we'd more<br>
ordinarily expect from a typical double-diffraction projector.<br>
<br>
<a href="http://techno-fandom.org/~hobbit/lighting/laserspray/" rel="noreferrer" target="_blank">
http://techno-fandom.org/~hobbit/lighting/laserspray/</a><br>
<br>
One way I've seen "stars" done is with seriously fast scanning and modulation,<br>
turning the (full) beam on for a very short line in various directions across<br>
a set of points, making a little six or eight way "splat" around each point to<br>
make it look more "star" like than just a dot. Something of that capability<br>
isn't going to come from fleabay for $200, especially if backed by software<br>
that could make those points move around and stay in self-alignment.<br>
<br>
And yeah, a genuine 2 or 5 watts is a lot. So easy to have these days, where<br>
not that long ago it took 208 3-phase, a rack of 2N3055s the size of Delaware,<br>
and water cooling...<br>
<br>
_H*<br>
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