You can even out the bright ends with mylar tape strip to keep the 2-4 O`clock and 8/10 O`clock segments of the tube from hitting the 4 in dimension of the neg. Then you add a vertical strip by each corner. I got mine to light perfectly.

Mylar is the silver slide binding tape 1/4 wide.

Ok for 4x5 but too little light for smaller formats.

Get an Aristo low power for 4x5 or a high power for smaller formats. Get the V54 tube model.

They make a nice one with a filter drawer