I'm sadly unable to find the original study where I found this. If memory serves me it was from around 2003.
Not sure how it would increase bacteria, as bacteria don't photosynthesis light, unless the lights gave off sufficient heat to increase their activity. If anything I would think the light might inhibit bacterial growth.
This is really interesting. I'm tempted to attach red LEDs to a battery and put it in the fridge. But it would be quite tricky to measure whether it works. (Almost impossible to do accurately, without different fridges.)
