96% efficient LEDs - can anyone trust it?

[Light superglue]

Hi,

Searching in ali I ran into this seller of UV curing modules for 3D printers. The LEDs here look different from ones in 100W LED I used to play with earlier.
In description/specs stands efficiency 96% and working temp 26.7-30ºC..."very low heat generating" (250W unit!)

What could it mean? From laser diodes I know that only IR and reds can reach 50-60% efficiency if kept well under room temperature.
And blue-violet ones (GaN) usually have 25% efficiency and can work at much higher temperatures without issues.

Is it a new type of light emitting material here or just cheating numbers?

116.1US $ 10% OFF|1pcs 250W 500W 1000W 200W UV 395nm 405nm High Power Purple LED Copper PCB for for uv light,Flatbed Printer,uv glue curing light|LED Bulbs & Tubes| - AliExpress

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[CurtisOliver]

Something sounds a bit off to me. Unless they’re reaching some special quantum efficiency I can’t see that being at all accurate. I have a 10W 375nm UV LED and that produced over 100 degrees of waste heat, without a heat sink and fan. They are not the most efficient LEDs out there.