Ok, I bought three of these true 5mW DX. All tests were made with my lab supply set to 3.2 VDC. All combined IR/green measurments were made right at the aperature, and all green beam power measurements were made from 2 feet away to avoid readings being affected by IR.
First, I opened my true 50mW DX that outputs 85 mW of combined IR/green, and 62 mW of green. The current was measured at 299 mA. This unit has the large resistor on the bottom of the driver board.
The lowest power unit out of the three true 5 mW units measured at about 16 mW of combined IR/green, and 5 mW of green at 2 feet away. Current was measures at 170 mA. Adjusting applied voltage a few tenths of a volt either way had absolutely no effect on current draw or output power. The current regulated driver worked as it should. And there is a large resistor on the driver board. I adjusted the pot on that units driver board until measured current was 299 mA. Output power measured was now 85.5 mW of combined IR/green, and 36 mW of green from 2 feet away. There is obviously a crystal alignment or crystal quality issue with that unit.
The other two true 5 mW units have not yet been opened or adjusted. One of those measured at 22 mW of green, and the other measured at 30 mW of green. I did not try to measure the combined IR/green. I did push the white fiber pad around the spring aside a little bit to see if these have the large resistor. Both of them have it.
So these were great little greenies for a great price.
Oh, and while I was at it, I tested a supposedly 50 mW module from o-like, measured output was 29 mW of green.
Bob