So Bert you have Rays Rabbit Laser USA website info and I have Marco's LightObject info which is somewhat different and I would trust them both. I have purchased from LO for over 3 years without issues. Here Is what I have and it works fine with my new chiller system which is the key... keeping the tube at 20 DegC for long life and max power. SPT 850mm CO2 Sealed Laser Tube (40W)