Too many lights or not enough battery?

[Divot]

I finished installing a second set of driving lights on my Valk yesterday.  By the time I got done checking that they work and getting them all aligned I apparently drained my battery and it would not turn over enough this morning to get it started.  I put the battery charger on it and after about an hour got it to start up. 
I put the choke on and let it run in the driveway for a bit, then I flipped the switch to turn on all the driving lights, the engine lugged down and the RPMs slowed by about 300.  Turn off the driving lights the engine would rev up, put them on and the engine would drop RPMs. 
After riding a ways I switched on the auxillary lights and noticed no effect to engine operation. 
Both sets of driving lights are wired together off the same relay terminal to allow them to be controlled by one switch. 
Did the engine lug down and lose RPMs when the auxillary lights were switched on just because the battery was low on charge or have I somehow over whelmed the electrical system?  Might this be an indication my battery is about to give up the ghost?  I just bought the MC and have no way of knowing how old the battery is. 

[DFragn]

I have 2 sets of driving lights. Each pair draws 100w. I never run 'em simultaneously. One is for night the other daytime running. My battery is good. I simply adjusted the idle RPM to compensate for the drain. So now with out the light draw my idle is at about 1100rpm or a tad more. When I switch on the additional 100w draw it's down to about 900rpm, just where I like it. Been running this way for many years on a single battery.
One set of lights is always on except during warm ups.

[sugerbear]

and as far as the battery, if in doubt, replace. it's easier in the driveway than on the roadway.

[John U.]

If I leave the choke on too long my bikes won't idle well. It may be that the egine was warm by the time you turned on the lights and running too rich to idle well.

[Rocketman]

If you used a trickle charger, which I've always been told to use with small batteries, you probably didn't wait long enough.  If the alternator was struggling to run the bike on a low voltage battery, and then you added the extra draw, that would explain it.

Sounds like you have several suggestions, and either one might be right.  Charge it for longer, then run it.  Get some more data.  You'll figure out what "normal" is.