Interesting, I've never had a single issue with my U2 mini running off an Uptone or Antipodes LPS.
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It comes down to the original product manufacturer (e.g., Lumin) being able to profitably and sustainably provide consistent quality and a standard, consistent, and actionable quality support capability for their products with respect to the company's product warranty for
all customers, not just a single customer. They also have safety codes, e.g., UL, IEC,
etc., that they have to conform to.
It can be next to impossible, and most likely, is impossible, for the original manufacturer, who BTW, have to create
value and provide
safety for their customers, to provide "warranty support" for any of a number of safety non-compliant 3rd party (e.g., LPS) manufacturers, when the original manufacturer has virtually
no control over the mfg. quality, SPC* and safety code compliance of these 3rd party products, and especially so when those products are installed by untrained customers. As such, no disciplined and mature company is going to provide warranty support for 3rd party companies modifying their products, let alone assume the
safety liability risk of untrained customers installing after-market products that are not compliant with electrical safety codes. This risk is further increased when it involves untrained customers “modifying and installing” the
electrical power subsystem of a non-compliant device or component.
Lumin is following standard and accepted best business practices for being able to provide consistent, predictable, and
safe product quality, and being able to back up that quality with a product warranty, and safety code compliance.
This is also why Mike has quite properly and accurately pointed out above that installing these products
voids the warranty.
*–SPC: Statistical Process Control. For any product to provide predictable and consistent quality, it has to be manufactured under statistical process control, with a Cp/CpK ≥ 4.0. This is MFG 101.