I was wondering if you can run an ROP Low lamp with 5 NIZN AA cells or will that voltage be too high. 5 NIZN cells would be 8v and 6 Eneloops are 7.2v right?
I don't know how the NiZn cell voltage holds up under significant loads, but you will find
this chart very useful for the 3854-L. (From
this thread).
There are many posts which indicate that the 3854-L is a very robust bulb, so if you're unsure, give it a try.
Edit: But, why NiZn unless you absolutely
have to? I know that specific combo might provide the best voltage match for what you're trying to do, but from what I've read, these cells had a rather poor longevity record. I'd
much rather build a Mag 2D ROP w/ 6x Eneloops & FM's 6xAA holder, or a build w/ 6x 1/2D NiMH's in a 3-4D Mag (unsure of the exact length of host required for those cells though).
Another option would be sub-C NiMH's for your Mag 5C, I'll bet you could get 6 of them in your 5C easily, with considerably more usable capacity than 5x NiZN.