The 4 pin is a more modern system and does work more effectively for 2d fluorescent bulbs.
2d light bulb 4 pin led.
Creates the same light as replaced 16 28w 2d cfl 4 pin lamp uses 50 less energy than equivalent cfl lamp lasts 3 x longer frequent switching turn on off as often as you like without compromising the lifespan of the lamp.
Only 9 left in stock.
Ge 55 watt 2d circline cfl with 4 pin base.
The 4 pin versions with the ballast do light up more quickly and a are less prome to flicker than the 2 pih.
Luxvista 2d led 18w 4000k 4 pin 2d retrofit flat panel led light with gr10q 4 base 18w gr10q 4 pin square bulb 28w 2d 4p cfl replacement bulb 2d gr10q led lamp for shopping hall remove ballast 3 3 out of 5 stars 7.
Luceco g24q 4 pin 2d led light bulb 2000lm 18w 9010x out of 5 stars 11.
However in comparison to the 2d led both are very poor.
Feit electric 26w equivalent pl vertical cflni 4 pin plug in gx24q 3 base cfl replacement led light bulb cool white 4100k 4 pack model pl26e v 841 led 4 10.
21 watt 2d 4 pin gr10q base 3500k neutral white f21 2d 835 4p 05735 su 21 watt 2d 4 pin gr10q base 3500k neutral white f21 2d 835 4p 05735 su 6 89.
2d 4 pin plug in compact fluorescent light bulbs.