You won't have to worry about effects or point sizes not scaling properly - they'll all be set correctly already.

When placing raster files into the Illustrator art layout, you won't have to scale them down - instead, simply preset the dimensions in Photoshop and place the files as needed.

Because a properly prepared Illustrator file will be almost the same file size at 50% scale as it would be at 100% scale.

Why work at 100% scale size in Illustrator?.Scale Select the grid scale to view or set the artboard and real-world measurements.

The options are centimeters, inches, pixels, and points. If you do have to scale down, be sure to let the print tech know the details. Select the units to measure the grid size. If that is the case, use 50% scale as your first option, or 25% scale as your next option. Only work at a smaller size if the artboard doesn't support your finished size. (9) It may seem counter-intuitive at first, but it's almost always better to work at 100% scale in Illustrator whenever possible. Higher resolutions should be avoided (and will be resampled down to 100ppi prior to press time anyway). (8) The optimum resolution for placed raster images at 100% scale is 100ppi. Retail Displays & Corporate Environments.Xclaim Fabric Table Top Pop Up Displays.

Illustrator how to scale