I have used this slave for years in my White Lightning units with no problems. However, they will not trigger the two Flashpoint II lights that I purchased. Wein says that the trigger voltage is not sufficient to fire the flash. Radio triggers work, but I do not want to use a radio trigger and have a transmitter connected to my camera. (100 % location work) Are there any sensitive photo slaves that might trigger my Adorama mono-lights?
Unfortunately, if you're really set on using optical slaves to trigger your lights, the Wein units offer the highest sensitivity. I'm curious though, the Flashpoint II monolights have a built in optical slave (in addition to the sync port) is there some reason that you're not utilizing those? Also, the product in this listing uses an H prong (household plug), is this this the same unit you've tried? If so so I assume you're using an adapter to connect to your lights (Flashpoint units do not have a H prong receptacle). It is possible that the polarity is incorrect, you may try removing the slave from the adapter, rotating it 180 degrees and re-inserting it. Some strobe units (Speedotron Brownline for example) are sensitive to the polarity and will not fire if the slave is inserted incorrectly.