The power consumption of a bulb is not a measure of its brightness - due to its low temperature, this bulb's black body spectrum is shifted much further towards

The power consumption of a bulb is not a measure of its brightness - due to its low temperature, this bulb's black body spectrum is shifted much further towards the red end of the optical range than a common 100 W bulb, which means that a larger proportion of its output is in the infrared, which is invisible, and much less of it is in the green, which is where human eyes are most sensitive. So, you'd need a lot more than 25 of those to achieve the same brightness (which still would not give you the same light color, though). The only reason why you can somewhat compare modern incandescent bulbs by power is because the manufacturers have standardized on specific operating temperatures (the "cartel") - however, that only works for a given type of bulb, not between a "normal" one and a halogen one, for example, much less for the centennial light. Still, all that indeed makes for even less reason to be impressed ...