not sure exactly but heres some info online. It looks to have similar leaf shape and size to Bloodgood which for bonsai sounds like is recommended for large bonsai. By no means an expert but thought could share what I found. Good luck
https://www.thetreecenter.com/fireglow-japanese-maple/
One of the most popular tree varieties is one with reddish or purplish foliage. This colorful variation can be found in large shade trees like beech or Norway maple, in many smaller trees, from birch to crabapple, and in shrubs too. The rich, dark tones make a beautiful contrast with the green-leaf plants around them, and these trees are always admired. Among the Japanese maples, the variety called ‘Bloodgood’, with its rich red leaves, has been widely planted for a long time, but it has some limitations. It grows into a larger tree, reaching 20 feet tall and wide – dimensions that mean it easily overpowers smaller gardens. As well, particularly in warmer zones, the red leaves have an unpleasant way of turning a dirty purple-green once summer arrives, and they definitely lose their charm. If you love the look of this tree, but have a smaller garden, or live in a hot zone, then you should choose instead the Fireglow Japanese Maple, which looks similar, but has none of these limitations.
Growing Fireglow Japanese Maple Trees
The Fireglow Japanese Maple develops into a well-formed small tree, typically reaching around 12 feet tall, and perhaps eventually reaching 15 feet. It is densely branched, and has an upright habit, with a rounded crown, so that it is rarely more than 10 feet wide. Those dimensions make it perfect as a specimen in a smaller garden, leaving plenty of room for other small trees. It looks lovely at the back of shrub beds, or planted in a row, perhaps along a boundary, or lining a driveway. The elegant leaves have 5 slender lobes, dividing the leaf deeply. Each lobe is toothed along its edges. These lovely leaves are a little larger, with slightly wider lobes, than the Bloodgood maple, so they are less prone to drying in summer – another plus.