I built the simple LED V Boost circuit at
Here are the various transistors and the total supply current for each at 1.5VVDC. Nothing but the transistor was changed between tests. The idea here is to show how much better the low Vce(sat) transistors do in a flyback type circuit where a lot of current is switched.2N3904 = 48 mA Can you spell W-I-M-P ??
2N4401 = 98 mA Supposed to handle a half amp.
BC338 = 132 mA Is good up to an Ic of 800 mA.
ZTX651 = 186 mA This has a max Ic of 2A
I couldn't test the BC639, 2SD965, and NTE11, etc., because the collector is the center pin and I would have to rewire the socket. I'll try these later, because they should do even better.