<html><head></head><body><div class="ydp4a9cf638yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">I am aware that a large percentage of "laser" products advertised on Ebay or Amazon are not lasers (neither company cares about fraudulent listings) . Though, I do think the star projector in the link I provided is a laser. I suspect the image is actually created by putting a laser beam through a type of hologram and then duplicating it with either a prism or diffraction grating. And color holograms that use 3 colors of laser are certainly viable to create. I don't know what the beam spread can be.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I also see the great advantage of a LED light source, in regard to eye safety. I imagine such a device would be essentially a gobo projector. But, I've never seen one with much of a beam spread. Though, if such a device was cheap enough, multiples could be used.<br></div><div><br></div><div class="ydp4a9cf638signature"><div style="font-family:Helvetica, Arial, sans-serif;font-size:16px;"><div dir="ltr" style="font-family:Helvetica, Arial, sans-serif;font-size:16px;">-Joe Dunfee<br></div><div dir="ltr" style="font-family:Helvetica, Arial, sans-serif;font-size:16px;"> 717-203-8670 Cell<br></div></div></div></div>
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On Wednesday, February 15, 2023 at 07:25:24 PM EST, Matthew Breton via Stagecraft <stagecraft@theatrical.net> wrote:
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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 clear="none">
Design for Theater and Dance </div>
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<div id="ydp792e77deyiv2791560400yqt46072" class="ydp792e77deyiv2791560400yqt2235833133"><div dir="ltr" id="ydp792e77deyiv2791560400divRplyFwdMsg"><font style="font-size:11pt;" face="Calibri, sans-serif" color="#000000"><b>From:</b> Stagecraft <stagecraft-bounces@theatrical.net> on behalf of PJ Veltri via Stagecraft <stagecraft@theatrical.net><br clear="none">
<b>Sent:</b> Monday, February 13, 2023 3:23 PM<br clear="none">
<b>To:</b> Stagecraft Mailing List <stagecraft@theatrical.net><br clear="none">
<b>Cc:</b> PJ Veltri <pjveltri@gmail.com><br clear="none">
<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="ydp792e77deyiv2791560400x_gmail_attr">On Mon, Feb 13, 2023 at 2:35 PM *Hobbit* via Stagecraft <<a shape="rect" href="mailto:stagecraft@theatrical.net" rel="nofollow" target="_blank">stagecraft@theatrical.net</a>> wrote:<br clear="none">
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The other problem with "white" is that it's usually a mix of wavelengths,<br clear="none">
and if the effect-generator does *anything* with diffraction you get a<br clear="none">
spread of the wavelengths, i.e. little sets of R/G/B dots. If this is the<br clear="none">
"Sharelife" unit I managed to search up, the supposed "output" does have a<br clear="none">
pattern, and it looks like it's a *de-saturated* photo of what we'd more<br clear="none">
ordinarily expect from a typical double-diffraction projector.<br clear="none">
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<a shape="rect" href="http://techno-fandom.org/~hobbit/lighting/laserspray/" rel="nofollow" target="_blank">
http://techno-fandom.org/~hobbit/lighting/laserspray/</a><br clear="none">
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One way I've seen "stars" done is with seriously fast scanning and modulation,<br clear="none">
turning the (full) beam on for a very short line in various directions across<br clear="none">
a set of points, making a little six or eight way "splat" around each point to<br clear="none">
make it look more "star" like than just a dot. Something of that capability<br clear="none">
isn't going to come from fleabay for $200, especially if backed by software<br clear="none">
that could make those points move around and stay in self-alignment.<br clear="none">
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And yeah, a genuine 2 or 5 watts is a lot. So easy to have these days, where<br clear="none">
not that long ago it took 208 3-phase, a rack of 2N3055s the size of Delaware,<br clear="none">
and water cooling...<br clear="none">
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_H*<br clear="none">
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