Is this a good idea to grow cactus with LED grow light?
Absolutely, most cacti require sunlight direct>
400 Watt Electronic Switchable Ballast Hydroponic Grow Lamp System with Metal Halide and High Pressure Sodium HPS Light Bulbs, Cord + Hanger, GYO2002
$155.00
This 400W hydroponics lighting system represents the best value grow light. Its advanced electronic ballast [...]