Take the 2-minute tour ×  I have eight (8) floodlights on my
tennis court. I didn't install these, they came with the court.
Floodlight just switched on Floodlight fully powered  Questions:
Recently, in the evening when it was cold I switched them on and
only 3 of the 8 came on. A few days later in the middle of the
day when it was warm I switched them on and all of them came on.
The normal functionality of the lights is that they slowly get
brighter and brighter (as you can see from the attached images)
until about 5 minutes has passed when they are fully "powered."
What type of bulbs are these that illuminate slowly? Is it
normally behavior that these lights might not work when it's
cold (a few degrees above freezing)?  share|improve this
question If it's temperature-related, the problem might be that
the bulbs just aren't screwed in firmly. These bulbs have the
same screw-in base as a regular lightbulb (just bigger!), and -
like regular lightbulbs - can work loose over time; the metal of
the bulb's base