You just need enough light reaching the guide camera to lock onto a star. As long as the image is focused and bright enough to do that, your guide system is doing its job.
Don't worry how much light is reaching the guide camera if it can do the above. That's my take on it anyway.
Celestron C9.25. Atlas EQG mount. Canon 500D unmodded, Celestron ST80 guide scope, SSAG, Meade 6.3 FR, Thousand Oaks dew control with Dewnot straps. Zhumell 8/24mm Zoom, 2"Gso Superview 42mm, Meade 2"QX wide angle 30MM, Meade 1.25 EP and filter set. Tasco 10x50 Zhumell 20x80 bino and a few other odds and ends.
Now where did I put that clear sky button!
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