I bought them after discovering that standard A21/23 type bulbs (typical looking bulbs) are actually more directional than omnidirectional (the light coming from the top of the bulb is brighter [brighter, more LUX -Performance] than the pages). I used four lamps configured with three lamp doublers and got 555 lux from 4 15 watt LED lamps on my desktop. When I switched to these splitters (putting all four bulbs in the same position), my lux meter read 750 - so I got 195 lux from the same bulbs - and a brighter working area. Good product! Works for me!
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