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Old 10-11-2014, 04:33 AM #1
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Default Spam email offering a scanner at low prices, what do you think?

I received an email out of the blue from Topic Light co. in China I have never contacted before offering a very nice looking scanner. From the looks of it, it is too low of a price for something which appears to be uber high quality and at such a high output. Has anyone here bought anything from this company before?

This is a cut and paste of their email:

PRICE is USD2,450/unit:

638nm Red 1W

520nm Green 1.5W

447nm Blue 3W,

PT-40K scanner system.




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Last edited by Alaskan; 10-11-2014 at 04:36 AM.
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Old 10-12-2014, 10:18 AM #2
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Default Re: Spam email offering a scanner at low prices, what do you think?

No, that is not exactly an extraordinarily low price, you can probably find several cheap companies offering similar projectors for similar price.

These cheap projector are often not very high quality though. I don't know how you infer that the one you were offered is high quality, they barely say anything about it. There are many aspects to consider rather than just power and scanning speed. For example:

- divergence
- how well the beams overlap
- noise level
- are the dichros adjustable or fixed
- the scanning width
- is the modulation analog or on/off (this is a big one, analog modulation looks way better)
- the overall quality of the components
- the size of heatsink and duty cycle
- warranty

And are the given specs even correct? Many chinese manufacturer rate their projectors at a way higher power and scanning speed than they actually are, no different than the pointer industry. The projector may be less than 2.5W total at the aperture and 20-30kpps and it wouldn't really surprise me.

Last edited by Grix; 10-12-2014 at 10:23 AM.
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Old 10-13-2014, 04:16 AM #3
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Default Re: Spam email offering a scanner at low prices, what do you think?

My mistake, I somehow missed the 2 in front of the 450 and you are right, I really don't know what the quality is, I only had an impression it was quality because it looked so cool to me. I really know nothing about projectors and because of that, looks is all I can judge by and from what you just explained, not a way to do so.
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To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 10-13-2014, 10:40 AM #4
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Default Re: Spam email offering a scanner at low prices, what do you think?

Haha, if the price were $450 then it would have been a great deal indeed
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Old 10-14-2014, 09:16 AM #5
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Default Re: Spam email offering a scanner at low prices, what do you think?

Hi, I'm Saifer from Topic Light.
Please see my post here:
SELLING 5.5W RGB laser light.

Power is after scanning, surely have 5.5W.

Laser module is from Spacelas,
Scanner is PT-40K.

Thank you!
Saifer
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