Wittner has been reperfing E100 for Super-8, and it's been getting much better reviews than 64T. Over on the forum at filmshooting.com (for mostly Super-8 and other small gauge cine formats), John Pytlak from Kodak has explained that one of the main reasons they went with 64T was because it was closer to 40, and would work better in cameras that didn't have a manual film-speed option.
The Beaulieau does have a manual film speed option, so I can just set it on the camera and use the camera's internal meter, but if I want to use a separate meter, the shutter speed is 1/87 sec. at 24 fps, so I can just meter as if it were 1/90. 18 fps is usually about 1/45 sec. There are conversion tables for other speeds usually in the documentation for most light meters. I suspect that this may vary if you have a camera with a 220-degree shutter for low light, so check your camera manual as well.