problem with emission and transparence

Hello everyone.
I have this scene.
/uploads/default/original/4X/f/e/4/fe43797ecc428b786a2d49930381606f66884834.JPGstc=1
If I turn on transparent, I got this result.
/uploads/default/original/4X/d/e/6/de671b18834522dd6da9e672a4c9806a373e723d.JPGstc=1
I would like combine this rendered image with a background image in the video sequence editor. What can one do in order to prevent the loss of the emission color.

thanks a lot for help

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