Black Dog Platinum XL-U 750w LED Grow Light Unboxing Review & PAR Test > Read more Tags: Black Dog LED Grow Lights Black Dog LEDs Black Dog PAR Tests Black Dog Platinum XL Black Dog Spectrum Black Dog Universal Series Categories: LEDs Unboxing And Reviews Comparison Tests Lighting Time: 8 Minute Read Date: Feb 21, 2013 Author: Staff @Growershouse