Tried a few more lasers and detectors, all worked just as good as the first test, easily reaching 7m with the prismatic tape reflector.
This is the reflective tape, but I have no specs or details about it. Can't even remember how I came to own it !.
I need a lot more, so I'll review those earlier posts showing some similar products.
The circuit I'm using is the standard one shown in earlier posts, and I've left the resistor on the laser board in place.
Power supply is 12v, and current used is about 6mA.
Now I'm designing a small PCB to hold the bits, with a transistor to invert the output, ( I need the LED 'on' when the beam is broken. )
Cheers,
Buzby