The first picture shows the experimental results obtained with the first white LEDs I have used (using a voltage of 3.0V).

The second one shows the experimental results obtained with the new white LEDs I am using this week (2.6 V).

The first ones are bigger than the second ones, and they are also much more brighter.

We can see in both graphs that there are some differences between flies with intact and clipped wings, being the ones with clipped wings less phototrophic than the others.

For now, graphics do not tell us almost anything about differences between both LEDs.