Find the stop difference between two lights set to different power levels.
Because light power and stops have a base-two relationship, halving a light's power is exactly one stop less output. Balancing strobes relies on setting power ratios in stops, which is the language the flash meter and the eye share.
Light Power Ratio (Stops)
Stops = log2(Light A power / Light B power)
Stops = log2(Light A power / Light B power) Because light power and stops have a base-two relationship, halving a light's power is exactly one stop less output.
Balancing strobes relies on setting power ratios in stops, which is the language the flash meter and the eye share.
This calculator takes 2 inputs: Light A power, Light B power. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.