Utilitech 144-in 3-Light Black 33-Watt Full Spectrum LED String Grow Lights Utilitech 144-in 3-Light Black 33-Watt Full Spectrum LED String Grow Lights 12Ft LED grow string light with 3 lights, using full spectrum for all stages of development, seeding, budding and flowering, LED integrated is maintenance-free with no bulbs to replace, linkable up to 16 units and plug-in easy operation. Full-spectrum using for all growth stages Integrated LED, maintenance-free with no bulbs to replace Linkable- link up to 16 units PPF 33.89 value Plastic Material The materials used to create this high-quality plastic chair are strong and won't break down rapidly when exposed to sunshine. It is durable and affordable. On/Off Switch It has an on/off switch, making it simpler to dim the light when not required. Plants only require the necessary amount of light, so this switch comes in handy. Integrated LED For better performance and energy savings, the light kit employs LED technology. Lights are regarded as a gentle, warm light. It does give the space ambient illumination. ETL Safety Listing A safety listing from the ETL or a certification from another NRTL is not universally required by law. However, before a product may be marketed in that place, many governments and localities want NRTL certification. Having your product ETL certified proves to your consumers that it is a safe product.