I have two 90w/12v infrared IR bulbs which is put into a r7s sockets. From thes socket goes in total four wires which is connected to our power supply. We have set two of the wires in serial so they pull 45 watts each, in total 90 watts.
The bulb is 90w / 12v
Our power supply is 12v / 8.3 amps
It should be able to power the bulbs since the power supply is 99.6 w and the bulbs are 90w in total.
But they don't, they cannot power the two bulbs.
However, if we put a bigger power supply which is 10a / 12v then it works.
If we then, after having the bigger power supply connected, switch to the smaller 99,6w power supply then it works as well.
It is only if we try to power the two bulbs directly from small one that it doesn't work.
My questions are
why can't the 99.6w power supply power the 90w IR bulbs? (They are in serial so they use 45w each)
is there a way we can lower the wattage of the bulbs? Maybe a resistance? Something else? I just need to lower them by 5 watts and I'm sure it'll work.
Thanks in advance, and thanks for reading my long post!