A quality Edison E27 corn CE stamped LED bulb weighing within a few grammes of the old 60 w. incandescent bulb leaving your Anglepoise lamp's delicate balance unaffected.

High efficiency: Heat output is less than previous with no UV or IR light radiation and the corn 72 5730 SMD LED bulb has a smaller footprint within the shade.
A+ power rating saves you money on your ever increasing
energy bill.
6000-6500 Kelvin daylight, 15 watt, AC 200-240 standard UK standard
B1 Edison screw base.
50,000 hours life, two years warranty.

Also suitable for SAD therapy use*, photography and indoor plants, terrariums and vivariums etc.
Light output seems to be significantly lower used with the later
Anglepoise model 75 and 90 shade
than with previous models.
Fast free postage via Royal Mail from the UK.
Expect delivery within four working days of order.

You no longer need overpriced light boxes to reap the benefits of daylight in winter. I use these as desk lights year round.
May seem a little harsh if not used to 6000K, may take a day
or two to get used to:

* January and February were sometimes a struggle for me. After changing my work desk light bulbs to LED daylight things took a turn for the better. Happy again.
I was surprised that something so cheap and simple could have such a marked positive effect.