CFL Lights take more than a minute to go from off to full intensity. Here I show the time. Also you can see an aberration of the LED light that it requires about a sixth of a second to turn on…
I’ve noticed shortly after buying my CFL bulbs how they take a noticeable amount of time to come up to full brightness. It wasn’t until I noticed that the LED bulb I recently purchased had a slow (delayed) turn on that I tried to quantify it. The attached photos document the turn on of the bulbs. I’ll comment as best I can.
The LED bulb is the third from the left. You can see that it takes about 15 or 16 100ths of a second to come on. When it finally decides to turn on, it comes on at full brightness (to my untrained eye) You can also see that there is a slight delay 0.01 seconds for one of the CFL bulbs to come on.
You can see the light come up and saturate the camera optics. Next if you look at the right side of the wall below the lights and watch the spot change size. As the lights come up in intensity the optics can compensate. My understanding of the bloom is that the optics/electronics can only compensate for a finite difference in light in intensity. As the CFL lights increase in intensity, and therefor even up, the bloom reduces.
AS the CFL bulbs increase in intensity, the bright spot continues to get smaller.
The lights continue increasing in intensity. By 1:22 (+1:16) the lights are pretty close to full intensity. I can notice a slight difference between the 1:22 image and 3:08 on the next line.
Here you can see the shutdown sequence. Left to right they are the last one at full intensity. The second one is starting to power down, the third the camera caught the power down. The next frame (not shown) was completely black.