What's the difference? LED

They are both 5 watt LEDs, not sure if the Reflector's Epistars are any different than the 300. The Reflector does have the veg/bloom switch, the 300 does not. That being said, I veg with the old style 300 and have no complaints compared to Metal Halide.
 
I am not sure about your 40w flood, guessing it's something that you picked up at a hardware store. You can use that with the Mars Hydro unit, it sure won't hurt anything. The Mars Hydro 300 is a solid unit for the price if you want a cheap LED to get you growing.
 
The 300 I've got is 3 watt diodes and the reflector is 5 watt diodes.
The 48x5 reflector draws ~100w.
The 100x3 draws ~130w.

You can easily grow one plant under either one of them.

Happy growing :Namaste:
 
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