These CFL grow lights are energy saving horticultural lamps for superior plant growth. There is an integrated ballast so no external ballast is required. The screw thread on the CFL lamp is an E40 thread fitting which is larger than household E21 fittings. You will need to purchase an E40 Lamp Holder.
These 130W CFL's (Compact Fluorescent Lamps) have minimal heat generation and have a 10,000 hour lamp life. CFL Lamps are Suitable For:
Powerplant CFL Grow Light Colour Temperatures
2700K (Red) - Suitable for flowering
6400K (White) - Suitable for propagation and growth
14000K (Purple)- Suitable for propagation and cuttings/cloning