I bought a Fenix red filter when they first came out and was rather disappointed. The filter colour was far too light, and compared to the red Surefire and Mag filters I have it looked positively orange. Because of the amount of light allowed out, especially in the hotspot, I'm not convinced this filter is as good for my night vision as the other red filters. Hopefully Fenix have made the later run units a much deeper shade. I gave up using it in the end because of the colour. I also found that the filter did not fit as many Fenix lights as the dealer advertised. There's quite a variation of head widths across the range and it fell off things like the L1T & L2T. It's fine with the P2&3D's but is a tight fit on the P1D.