im using a home made box lined with silver mylar 1msq -1.5m tall with a 400w sodium bulb, started with 4 plants & lost 2early through bein a clumsy ba***rd. the 2 left are AK47, been under 18hrs of light for 4 weeks now, their 8 -10 inches tall and startin to get bushy up top. fingers crossed.:rasta: