150w infrared lamp generates a comfortable heat if you place it on the right distance.
For years I’ve used IR light during my routines and got no complains at all. Started with an 1200w halogen heater but was too much.
Either infrared or halogen heaters, it is recommended that you don’t stare or point the beam at your eyes or testicles. A reflective wrapping around the testicles should help.
I have one electric heating pad but like the halogen, at the lowest settings, it is too hot. Also have heating gel pads but don’t recall using them while pumping.
Out there we still have TDP lights. Like regular infrared, it is used in physiotherapy and it promises a deeper heat with improved healing. It is said to be milder than regular infrared and surely more expensive.