If you used a automobile sealed beam it wouldn't. Vibration kills them and the lense pattern is wrong also.
Original headlamps are usually a 35/45 watt bulb. Not enough if you ride at night, ok for daytime.
Buy a motorcycle rated headlamp with a replacable bulb, H4, and run a heavy duty 55/65w bulb for night riding.
Another option is to go with the LED conversion kits or HID although I don't think your charge system will handle the HID

 

I didn't use an automobile headlight, I replaced it with a NOS sealed beam. LED would be fine but are there any popular choices for that?

 

I don't know. I'm using a Duc Monster 7" headlight ass'y.
Try a search here on LED headlights

 

There is a 7" H4 headlight replacement that fits directly onto the CB450 over at
DCC for only about $15. You can also get a 35W H4 bulb there too so you don't kill your battery or you can go with a
35W HID kit

 

That's exactly what I'm looking for, thanks!

 

Just for the record, I found a replacement headlamp, shell and all, on eBay, which came with a 55/60W H4 bulb. I replaced the bulb with a 35W HID, and couldn't be happier. The shell is chrome instead of painted, but it works. I had to make a bracket, held beneath the headlamp with the lower fork bolts, to mount the electronics for it, but it doesn't look too bad there.

 

Hey wintersol,

Did you use a projector headlight or just a regular headlight for your HID setup?

 

Just a regular, H4 style lamp.