This may sound unfair but here is my situation and concern.
I've bought a Osram crosser 3-led spotlight a while ago. The light runs off 4 D-cell alkalines. I was under the impression that you can't use D-cell rechargebles in them as they dont have a metal positive that covers the top of the battery like its the case with alkalines. The light has wide springs so to get the positive tab to make contact the springs would require some modding.
So I've decided to cut everything out and use 4 AA nimh batteries in an adapter. Actually I've got 3 packs to run in parallel for increased runtimes.
I then thought that since the light only draws about 0.96 amps and the Nimh is only 1.2V against the 1.5V of the D-cells, that the light might be a little less bright now.
So I went to my father who owns the same light but still in standerd form.
Now here is my concern, at long last.. My light is twice as bright as my fathers? How can this be possible with 1.2V less, at this relatively low ampdraw? Will this mean that the led's might burn out prematurely?
I really thought that big D-cell alkalines would sag a lot less under a small load like this