1) Cfl light can install in the light
2) It's spiral

Features:

Cfl light

1) Need no dimmer, use general ON/OFF switch
2) Flicker free, instant start
3) Luminance Memory Function

Specification:

1) Voltage: 220-240V AC/50-60Hz
2) Power: 20W
3) Lumens: 1400Lm
4) Color Temp: 2700K/4100K/6500K
5) Life Time: 10, 000hrs
6) Material: PBT+Glass Tube
7) Size (mm): Tube: 10 OD: 50 Length: 140