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Forums
4hv.org :: Forums :: Electromagnetic Radiation
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Ways to know how powerful a laser really is.

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Meatball
Mon Oct 12 2009, 06:07PM
Meatball Registered Member #2401 Joined: Mon Sept 28 2009, 04:25PM
Location:
Posts: 74
Ebay thugs like to use ignorance as a tool for sales. They think they can throw a diode in a module and get away with calling it a laser.

635nm 5.6mm diodes come in a 250mw at maximum. Most can be pushed further, but not for long.

If you must ebay your lasers, only buy from large companies.
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LutzH
Sat Oct 17 2009, 08:16AM
LutzH Registered Member #1721 Joined: Sat Sept 27 2008, 08:44PM
Location:
Posts: 136
Three Words: "Leave Appropriate Feedback" Most laser sellers on ebay are good, but nasty feedback helps throw out the bad apples. With China you have to watch it though, HK sellers are great, but mainland China sucks, they close after bad feeedback, and then re-open under a new name.
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Will
Sun Oct 18 2009, 05:16AM
Will Registered Member #57 Joined: Thu Feb 09 2006, 05:28AM
Location: San Diego, CA
Posts: 27
Here’s the thing about leaving this seller negative feedback: he refunded me, and didn’t even require me to return it the item. He was never rude and offered a full refund upon first asking if it was indeed the advertised output value. He did profess the stated output to be accurate, and that they test the laser's output with a meter prior to shipping, so that was a rather nasty lie.

Believe me I do wish to leave the appropriate feedback so that others don’t get caught in this fraud. In my case the seller made good, in every way within his power, on my purchase, therefore I don‘t feel a negative feedback would be justified.
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Bored Chemist
Wed Oct 21 2009, 05:04PM
Bored Chemist Registered Member #193 Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Long ago before ultrasound scans and such there was a doctor who ripped people off.
He offered a service to pregnant women where he would predict the sex of the child.
He asked for a urine sample then went to his "lab" to do the "test". In fact, once out of sight he just tossed a coin. Heads for a boy tails for a girl.
He charged a small fee for this service and, being fair minded, he gave back the money if he got the answer wrong.

Half the time he made a profit (by luck) half the time he didn't- but he made no loss.

Was his behaviour acceptable? If you found out about him would you have reported him?

Is it acceptable to provide a duff service and only pay back the money to the ones who complain?

I understand that it feels "wrong" to leave negative feedback in this case but how else do you stop the seller committing fraud?
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