Glorious light, weak springs
I've been using these for 20 years--I have three, and I love them.  Of course I have a mother lode of 100W, 1690-lumen incandescents, which you need for these--don't be fooled by the low-wattage one they include in the package. (Since the ban, you can't get normal 100W bulbs easily, but there are places where you can buy 100W halogens that fit normal medium base light sockets like this one.  You really want >1500 lumens, trust me.)<br /><br />The combination of a cool white fluorescent and a 100W incandescent gives a beautiful uniform low-contrast light that's first rate for close work.<br /><br />Don't be fooled by the cheap 'n' nasty Ledu knockoffs!<br /><br />It would be five stars, except that the last one of these I bought had springs too weak to hold it up--I had to put another spring in parallel with each one.  (I had a big spring assortment from Harbor Freight in my workbench drawer, so this only took a few minutes.)
Rating: 4 stars