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The light from an incandescent bulb is scattered...mostly up and out. This spill light is worse with CFL or LED bulbs.
When we reach middle age, we need increasing light levels to compensate for a decline in vision.
10 TIMES MORE LIGHT on the surface for only 30 watts. Light is directed down, with ambient light still flowing up and out.
14W (60W equivalent) fluorescent bulb. Light glows up and out, with no focus on the surface.
Light is directed down and out.
10W (60W equivalent) LED...Light is beamed up. Only a portion is directed by the lampshade to the surface.
I placed a Booster Bulb in the socket nearest my wife’s cross stitch and it instantly measured over 300 footcandles on her pattern. 5 TIMES THE LIGHT SHE HAD FROM HER 150 WATT BULB. She suggested that we include a booster bulb with every lamp sold.