QuoteIt seems that, unless there is a mistake in these plots (which should be checked) that the reactor shouldn't be glowing any stronger than a 60 W ordinary incandescent bulb at the maximum temperature, and would be quite a bit dimmer at 1260°C.
Antoine - this comparison is wrong. Lumens measure total light output weighted by eye sensitivity. Perceived brightness of emitter must be lumens divided by surface area. The issue for what it looks like, in any case, is color. 1400 (the claimed temp) and 780 (the real temp) look very different. FWIW, the reactor is of course dimmer than a 60W bulb!