
Not as cheap to buy as wire nuts but connection is faster than wire nuts, locking provides much more positive feedback, sure contact is complete than wire nuts, requires fewer tools , and you can still do half of the wiring work on the ground. When your time, safety and convenience are at stake, they are cheaper than wire nuts.

π΅ GKEEMARS 106 Pcs Lever Wire Nuts Connectors: Compact Splicing Kit for Electrical Wires - Solid, Stranded, and Flexible Wires (Blue)
9 Review

CEDFONJER Conductor Terminal Block: 24 Pack of Multi-Function SPL-1 Quick Terminal Block Splicing Type Compact Wire Connectors for Universal Soft and Hard Wire Assortment Conductors
8 Review

50-Pack Lever Connectors Nuts 5 Conductor Combination Compact Wire Connectors Fast Connection Terminal 28-12 AWG Multi Type Compatible
23 Review

π WAGO 221 LEVER-NUTS 78pc Compact Splicing Wire Connector Assortment with Case: Convenient and Versatile Solution for Electrical Connections
10 Review

Wireless Electronic Ballast Interface Certified
8 Review

Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review

π‘ Hydrofarm Quantum QT400 Dimmable Ballast for 400W Grow Lights
5 Review

Robertson Worldwide ISL432T8HEMV AH 3P20160 120-277V 50-60Hz High Power Factor 4 F32T8 Linear Lamp Fluorescent eBallast
6 Review