I have installed a Utilitech fluorescent fixture (with two 38w tubes) into my garage ceiling. And I'm using an existing motion detector switch.
This new light glows when in the motion detect mode (the old one did not) yet it works fine, coming on full when motion is detected.
Is there a safety issue here? Will this 'glow' cause my ballast to go out sooner?
Why did the old one not glow, yet the new one does? The new one seems to be a newer energy saving model.

I'm mostly concerned with safety and life of fixture. Thanks.