Granulated cork bark instead of perlite. Living in the iberian peninsula is the way to go, locally harvested so the money stays here instead of going to a big mining company. No perlite dust either. Next want to try the expanded version, cooked in autoclave at 360ºC.
Veg light. 281b+ diodes, 65w (1.4amps).
Flood light case, two 700mA drivers in parallel, all free. I just paid the led board, less than 25€. I work in maintenance and get free stuff.
Saludos from Spain.