it would need to be about 1000 degrees, possibly more, to get the incandescent glow
If you're trying to reproduce the effect, you'll need as much conductive heat transfer as possible. Bank the coals as much as you can
I have some techniques for getting a ultra-raging bed of coals that might help you out.
1. bank one chimney of unlit lump
2. add one chimney of lit lump
3. wait 10 minutes (no lid)
4. add another chimney of unlit lump
5. wait 10 minutes
6. add anoter 3/4 chimney of unlit lump
7. stir the coals to knock off ash and distribute unlit
8. stoke (bellows, air pump, fan, hair dryer, leaf blower)
warning - that will literally destroy your cooking and your charcoal grates. This gets hot enough to full melt aluminum.