30W~35W Sealed CO2 Laser Tube

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Other products by Lightobject
Item #: LSR-SPT35W720MM
Reg. Price: $195.00
Our Price: $180.00
27 units available



This high quality CO2 laser tube is made exclusively for the small K40 laser machine. Unlike other low quality tubes you may find on sites such as eBay, this tube is made by a reputable company. The output is very stable with low beam divergence. The length of the tube is 720mm or 28.5" .


Shipped from California.  All tubes are tested with power meter prior to shipping. Do not over current or the life span is shorten.



    • Power: Rated 35W (38W peak)
    • Triggering Voltage: 20KV
    • Operating Voltage: 15KV
    • Current: 16mA, suggest current: 15mA or below
    • Length: 720mm (28.5") +/- 10mm
    • Diameter: 50mm (2")
    • Water Cooling required. 18~24'C(64-75F)
    • Warranty: 3 months


Why buy a laser tube from us?

1) We're located in USA (Sacramento, California). No US Custom issue

2) We provide great tech support. We are knowledgeable, and we know what we're selling

3) Fast turn around time for tube replacement

4) Competitive pricing because we deal direct with the manufacturers

5) High quality and great packing


We test each tube with industry grade laser power meter before shipped. We pick the best tube to ship to you.


 (Note: pictures are showing a test for a 60W laser tube)



Note: 600W water chiller with compressor (refrigerant) is highly recommended  for cooling. Recommend LightObject  LO-600W chiller.


Shipping: Default shipping method is UPS ground for all laser tube orders.  Please contact us for the price if faster service is needed.

Get a quote on shipping fee: add all items to the shopping cart. Click the "cart icon" on the upper right corner of the page. Lastly, enter you state and zip code, our shipping estimator will show the shipping fee along with the available shipping method.

Multiple Item Orders -  please add each item to the cart and then click on the "Shipping Estimator" to get the shipping cost.


Note: International buyers are responsible for duty tax.


Courtesy reminder: Any damage that happens during shipping, the buyer must report to us within 3 business days after receiving it. Failing to do so will result in rejection of all claims. Customers must file a report to the Carrier and keep all shipping materials handy for inspection. The buyer is responsible for the shipping cost of a replacement tube after 30 days of receiving the product.


Model C40-700mm
Description K40/D40 35W CO2 Lase Tube
Power 32~35W
Warranty 3 months (90 days)


Average Rating:
(based on 15 reviews)

Showing 1 - 5 of 15 Reviews:

by Jeremy
on 12/15/2018
Great tube
Works great, well packaged! I am very happy, will buy again when needed!!
by Kyle
on 11/9/2018
Bought this to replace my tube on the K40 and it was extremely easy to install. Perfect fit and after an alignment with new SI mirrors I’m back up and running. Fast shipping and tube was packaged extremely well. Awesome product and great company.
by Allen
on 11/4/2018
Met my expectations
I built my own BuildLog laser in 2013 and it finally died. I chose this tube as a replacement and I am glad I did. It is a quality device, actually better in person than the pictures (as of time of this review) indicate. The output head is an anodized aluminum, the water tubing is of good quality silicon (so it looks anyway) and the high voltage lead is -very- well supported and attached. I didn't care for the ground wire (too short for my application), so I discarded it but I don't count that against the tube as I was going to replace whatever came on it anyway. The glass tube was packaged quite well and I think it could easily withstand shipping issues with no issues. I purchased my other laser components here from LightObject and I will continue to do so because the support and quality of components is excellent.
by Doug
on 10/24/2018
Tube saved a large job
The original tube just quit in the middle of a large job. Had ordered this tube to have just in case a week ago. Seems to cut much better at lower power.
by Stuart
on 10/15/2018
Drop-in replacement for Chinese laser, good support
This was my first tube replacement. I received excellent support before and after the purchase of the tube.The tube was tested, dated, and the results were documented. The tube was very well packaged and arrive unscathed. There was a tiny bit of water in the tube which indicates recent testing. Metal water inlets seems to be better design than the all-glass. Tube is "pre-wired", so I had to "butt splice" the high-voltage and return wires. So far it's working great! The only VERY minor feedback is that it would have been nice to get a little more documentation on the best practice for making the wiring splices, but there are lots of resources on the Internet for that.
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