FM35 and FM36 filter observation

wvguy

Newly Enlightened
Joined
Aug 8, 2008
Messages
14
I recently noticed some interesting things with two of my flip up filters

I have two surefire 6p's one with a high out put LED drop in and one with the factory p60 incandescent bulb.

When I put the FM35 Red filter on the LED light its not very bright (I know its not suppose to be) but When I put it on the P60 incandescent light its much brighter

The FM36 blue filter is just the opposite. Very Bright on the LED and not very bright on the P60 incandescent bulb


Does anyone know why they are like that?
 

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,715
Location
Copenhagen, Denmark
I recently noticed some interesting things with two of my flip up filters

I have two surefire 6p's one with a high out put LED drop in and one with the factory p60 incandescent bulb.

When I put the FM35 Red filter on the LED light its not very bright (I know its not suppose to be) but When I put it on the P60 incandescent light its much brighter

The FM36 blue filter is just the opposite. Very Bright on the LED and not very bright on the P60 incandescent bulb

Does anyone know why they are like that?

A incan light has a full spectrum, i.e. the light contains all colors.

Leds are blue, with some phosphor that converts some of the blue light to green/yellow light.

At the led museum your can see the color contents of a led:
http://ledmuseum.candlepower.us/seventee/ultrafir.htm

And a incan:
http://ledmuseum.candlepower.us/seventee/easyfind.htm
 

jzmtl

Flashlight Enthusiast
Joined
Dec 4, 2006
Messages
3,123
Location
Montreal, Canada
This is the output of incandescent bulb:

incanfl5.gif


This is the output of LED:

lednu4.gif


Should be pretty clear why. :)
 

wvguy

Newly Enlightened
Joined
Aug 8, 2008
Messages
14
Thank you. The graphs do make it clear.

another thing I noticed with the FM 35 Red filter is when you hold it at an angle you get white/blueish light.


DSC03383.JPG


DSC03384.JPG
 
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