vegging under 315 watt LEC 4200K

In the last 2 weeks since hanging this light, My leaves have tripled in size and the plants are more bushy then they have ever been. Was using the old 400 CMH

ive only used mine for preflowering. i tried to veg with my 3100K bulb before i had the 4200 and they stretched like a mofo (relative to either 6500k t5 or blurple set to veg)