KKMoon NEJE 20W Laser Engraver - Page 1
Forum section: electronics / general

author: inertg
author_rank: Contributor
timestamp: February 06, 2020, 03:02:10 am
content: TheKKMoon 20W Laser Engraver, implication that its laser beam is 20W is misleading. First, the specification "Laser Power: 20W ( Laser input:12v2A )" in the details means that the laser head consumes 24W but considering heat loss and other factors, the output is a laser beam of several magnitude lower power. As of 2019, the highest efficiency blue laser diode known is theNUBM44/47 NICHIAwith an output of 6W so it is doubtful that KKMoon 20W laser engraver can output a higher power beam unless it has several laser diodes with a beam concentrator.When Iddle but connected via USB to a computer, power consumption is 6.36WWith laser engraver at 50%, power consumption is 16.31W so net power consumption for laser head is 9.95WWith laser engraver at 100%, power consumption is 25.30W so net power consumption for laser head is 18.94W

author: PlainName
author_rank: Super Contributor
timestamp: February 06, 2020, 10:49:55 am
content: Terrifying, even if it's only a couple of W in practice. I've bought laser products before now and then not turned them on because I value my eyesight too much. Sure, you can wear goggles but it only takes one moment of inattention and you've lost stereo vision at best. That, there, only needs a tiny bit of foil stuck to the cardboard along with a bit of bad luck...

author: Domagoj T
author_rank: Frequent Contributor
timestamp: February 06, 2020, 11:09:11 pm
content: Surely the lack of enclosure around that thing is the dodgier aspect of the product than the inflated specs.

author: thm_w
author_rank: Super Contributor
timestamp: February 06, 2020, 11:33:04 pm
content: I wouldn't criticize them for that, that is basically how all other laser engravers on aliexpress are rated as far as I can tell.Most LEDs are similarly rated, input power, not optical output power.

author: PlainName
author_rank: Super Contributor
timestamp: February 07, 2020, 07:45:29 am
content: QuoteYes, but being so critical (and ignored) it should be an essential part of the product. Of course, that would double the price, but it is no less of a safety issue than a 0.25mm clearance between mains and logic ground, or potential for dead short with no fuse across Li-ion batteries, etc.

author: inertg
author_rank: Contributor
timestamp: February 07, 2020, 04:05:22 pm
content: Below is the reply from seller. Can anybody find the 5.5W laser optical output in any of part of the description herehttps://www.amazon.ca/gp/product/B07VRJW9JWand herehttp://nejetool.com/master_3500.html?Received: Fri, 7 Feb 2020 05:44:53 -0800 (PST)You have received a message from the Amazon Seller - OvskyOrder ID: 701-2102695-XXXXXXXCount Product Name and ASIN1product imageKKmoon 20W Desktop La-ser Engraver Portable Engraving Carving Machine Mini Carver DIY La-ser Logo Mark Printer for Metal Engraving and Deep Wood EngraASIN: B07VRJW9JWDear sir or madam,Sorry for the waiting, this is the reply form our supplier:The power of the whole machine is 20w, and the single optical output power is 5.5w.These instructions are noted in the description of your purchase.If still can't solve the problem, please contact us.Waiting for your reply.Thanks