Did anyone fit a suitable filter to the old stainless steel 2-emitter “BLF Special 400nm/365nm Edtion” light?
That’s the one with the dragon etched on the battery tube.
I wasn’t sure what wavelengths I want to filter out when using that.
I found the ZWB2 glass rather brittle, I could not get it cut nicely with a glass cutter, and knibbling bits off with pliers did not work either.
The ZWB2 filter is only useful for 365nm leds, apart from 365nm light they emit a broad white-ish band in visible light too interfering with fluorescence light. The filter’s transmission peak is at 365nm and blocks all visible light so it gets rid of the white-ish stray light.
It is no good for 400nm leds, 400nm leds do not have the interfering white light, just the 400nm peak so there is nothing sensible to filter out. Moreover the ZWB2 filter blocks a lot of 400nm light so it weakens the led.
Thanks djozz