I'm having trouble with my FW3T. I just got this last week. The details say Sapphire lens.
Mine got shipped with some type of poly carbonate. I accidentally left the light on a medium
setting overnight(or it came on by itself) bezel down. The Carclo optics are fine, not so for the lens.
Who do I ask for the correct lens? Neal or Lumintop?
Are you in New York? I have a spare carclo, but my sapphire lenses from Neal are somewhere between here and China. They appear to be in the US but are doing the shipping partner shuffle.
MTN sells the Carclo in the US, but I don’t see a link for the front lens.
Default thermal stepdown is 55°C or 60°C (I can’t remember which).
It can’t measure how hot the optic and glass lens gets, it just measures the flashlight body (temp sensor built into the MCU of the driver). Normally the optic and lens don’t get very hot. The plastic that Carclo uses is good for about 120°C. If you leave the light face down on a dark table (it may not have to be that dark) you get a lot of heat absorption into the table. This heat is then trapped. You create a little oven with the optic and lens inside. As the air is sealed off, the temps get higher and higher and they get damaged.
I don't think it's glass. I read an FW3A update about switching to an all in one different vendor's optics that didn't use a glass window.
Perhaps this lens is one of those :shrug: I'm waiting for a response to my email to Neal.
Edit: I just checked the Light Blond wood it was set down on, Triangular blackened burn marks etched into the wood. Yikes. I think I'll mill
some crenulations into the bezel so I can see if it's on.
I did this to my light, showing off its burning capabilities… In my case the singe on the lens scared me at first… But it cleaned right off - it wasn’t the lens material, rather a deposit from whatever I was vaporizing over and over……