Whats the difference between 0.3 coil and 0.5

[smizak]

Hey @DaveP is that your Les? Love the gold top. I have a cherry SG standard.

 

[DaveP]

OP asked two simple questions, stating the power & delivery device combo.
Regulated - replaceable head type.

Technically, that's correct. Then, the discussion of how wire type and coil size played into his choice began to be addressed. The info posted by most was pertinent, IMO. Hopefully, it was all helpful in explaining why different coils required more power to work properly and which were good for various wattage settings.