Was just discussing last week with a colleague how for the same 'lumen' there was such a dramatic difference between led and incandescent bulbs for ease of reading paper books.
There are very great differences in light quality between various kinds of LED lamps.
You may have various LED lamps, all of which appear to have the same white color, but their spectra are very different. Those with narrow spectral peaks are very bad lighting sources, while those with wide spectral peaks, achieved by using multiple kinds of conversion phosphors, are much better lighting sources.
With the best LED lamps, there is not much difference in comparison with incandescent lamps. While incandescent lamps are best from the point of view of their continuous spectrum, their yellow light strongly modifies the perceived colors. While bluish white LEDs (e.g. of 6500 K color temperature) are also bad, neutral white LEDs (e.g. 5000 K or 5500 K) provide much better color perception than incandescent lamps.
For home lighting I prefer a white that is only very slightly yellowish, i.e. 4000 K lamps, instead of LED lamps with a higher color temperature or of incandescent lamps, which are so obviously yellow that no clothes have the same color as in daylight.
The best quality of lighting can be achieved by incandescent lamps in conjunction with frequency-selective filters, which modify their spectra to resemble the spectra of a blackbody with a higher temperature, like the Sun.
Such filtered incandescent lamps were used a very long time ago, to provide lighting for color photography, movies and television (e.g. for the original white point of NTSC), but they were abandoned due to high cost and due to an exceedingly low energy efficiency.
As I have mentioned in another comment, filtered incandescent lamps might see a revival, but implemented with very different technologies than those used a century ago.
I use 90CRI LED lights where I study. They are Philips' non-flickering, dimmable, High CRI bulbs, yet my classic 25W halogen table lamp still provides a far better reading experience. The spiky spectra of LED lights are not comfortable for eyes as a full-spectra incandescent light, let it be classic or halogen.
90CRI isn't good enough to replicate an incandescent bulb in my experience. Something in the high 90's can be much better (but admittedly hard to find). And of course you may want to match your preferred color temperature too.
Actually, this is the best I was able to find. The prices increase almost exponentially when you try to go to higher end of anything, and I was not in a mood for digging whole city and the internet for a single bulb. A Philips' 90CRI bulb is already a great upgrade from an 80CRI bulb, so I ran with what I was able to find in a pragmatic time frame.
For reading black & white text, incandescent lamps are perfectly fine.
However, if your book has color illustrations, a high-quality neutral-white LED lamp is better than any unfiltered incandescent lamp.
A standard white illuminant with filtered incandescent lamps would be even better, but such lamps, as they were made a century ago, were extremely good space heaters, which may prevent their use for reading a book.
The OSRAM halogen lamp I use has special filters, and looks greenish when it's turned off, so it might not be a "brute force, let everything through", 25¢ halogen lamp. The bad thing is it's not being produced anymore, but I have a couple of spares.
I went through university with the same lamp/bulb, so that combo doesn't create the unwanted reflections much. Also, I still print everything in color, because a good color choice still boosts understandability of the material at hand.
