The 2.5W rating on our google store is about 8 months ago when this diode is released and we didn't update products data for the old store since the new store is opened.
We deleted the goggle store to concentrate orders and sales and the shutdown was happen before you told us there's a problem though.
We listed this G84 diode laser as "1.6W~1.8W" on our new store since it's opened.
The problem with this diode is, although it does capable to put over 2W of power, when using in a handheld device, the focus lens cannot absorb/collect all the light from the diode because of the bad beam divergence.
The highest output we can push this diode on a handheld device is about 2W but it would generate as much heat of a NDB7A75 diode.
From the distance you metered it, the lpm did not seems to have full contact of the beam and since the laser is using G7, there should be a upgrade on the output if you switch to G2 lens, it should be at least 1600mw or more as we advertising.
Even at 1.45w, the diode has sending out 2W of power already. You can meter the raw output from the diode to check that.
Normally, this laser should be doing 1.6W with G7 lens, the switch might be responsible for this problem.
If you want any help or solution, you can pm me or contact us via this email:
sanwulasers@gmail.com.