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LED Spot combined with Strobe?

  • The LED is 'always on'...meter as you would any constant source...it is no different than sunlight (with exception of color temperature and intensity).
  • The strobe is 'briefly on'...meter is with a flash meter.
Set the aperture to suit the output of the flash, per the flash meter.
Then adjust the shutter speed to suit the lower intensity (usually) of the LED, compared to the strobe (unless you have manually chosen a low fractional output from the strobe) for the chosen aperture.

The relative strength of LED vs. strobe is simply to achieve what you have in your mind's eye for the shot.
 
Yes, unless you are talking about putting an incident meter under the led. It is part of your scene.
 
 
I think you will find that unless you use a very long exposure or drastically cut the intensity of the strobe (distance, diffusion, ND gel, low power setting) the strobe will overwhelm the LED--you won't see it at all. The meter readings should show you that. LED as fill might work, but as a spot I doubt it.
 

Thank you
 

Thank you
 
You could make two exposures, one with the LED which could be minutes......... You can measure the intensity and test it a few times if needed
Then "pop" the strobe and close the shutter.
 
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