Yes, the Streamlight TLR-1 HL LED Weapon Light is compatible with the Walther PDP.
The earless screw Streamlight TLR-1 HL Rail-Mounted Tactical Flashlight would be compatible with your FNX-45 Tactical. It can be found by using the link below:
https://www.opticsplanet.com/streamlight-tlr-1-hl-with-lithium-batteries-fde-b.html?_iv_code=SQ-FLW-TLR1HL-69252&_iv_included-accessories=earless-screw
Yes. The Streamlight TLR-1 HL LED Weapon Light will fit your M&P. It will also come with keys for Glock-style, Picatinny, Beretta 90two, S&W 99 and S&W TSW and Sig P320 if the light does not mount directly to the picatinny rail. If that were the case for you, you would use the provided S&W TSW key to fit the light.
Yes. The Streamlight TLR-1 HL will fit and function just fine on the 509M.
The rail on the Taurus G2c is too short to properly mount the Streamlight TLR-1 HL. I would not recommend using this light. The TLR-7 would be a more viable option as it is much more compact and can fit on significantly smaller rails.
https://www.opticsplanet.com/streamlight-tlr-7-weapon-light.html
Yes, it should work well.
Yes, this should work well.
The light Output is 1000 lumens.
Yes, it should work well on both models.
Yes, this will work well with all those listed.