Forward flux

[Gswiss]

The environment is light measurement techniques. I'm trying to find the actual French equivalent for forward flux in the sentence shown below. I have no translation I could suggest. Forward flux or Forward spectral flux are referred to on the following site:

http://www.labsphere.com/products/sp...standards.aspx

Please advise.

"The base port for the light measurement sphere admits additional cables for assembled fixtures while the external port provides for the unobstructed positioning of boardmounted or heat-sinked devices for forward and partial flux measurements."