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How do I Lower wattage of Bulbs

Af Mega Supporter bartman | 08-12-2018 10:49 | 815 visninger | 4 svar, hop til seneste
Hi hardwareonlineI have two 90w/12v bulbs which is put into a r7s sockets. From these 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 / 12vOur power supply is 12v / 8.3 ampsIt should be able to power the bulbs since the power supply is 99.6 w and the bulbs are 90w in total.But they dont, 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 doesnt 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 wattage and I'm sure it'll work.Thanks in advance, and thanks for reading my long post!
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#1
gasolin
Guru
08-12-2018 11:02

Rapporter til Admin
Buy lower voltage bulbs
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#2
16bamse
Giga Supporter
08-12-2018 11:11

Rapporter til Admin
Well you kind of found the fix yourself, buy a bigger PSU. Some bulbs draw more current when they are starting up, thats why the small PSU can't handle them when they are cold.
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#3
Nubi
Giga Nørd
08-12-2018 12:09

Rapporter til Admin
You could use a power resistor. A normal resistor can't handle the amount of power the bulbs are pulling, so it'll burn out. You can read more about power resistors here: http://www.resistorguide.com[...]
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Sidst redigeret 08-12-2018 12:10
#4
bartman
Mega Supporter
08-12-2018 14:10

Rapporter til Admin
#3 Hi Nubi, Thanks for your input. Do you have an idea exactly which power resistor we should choose? We have a 99.6w power supply which is 12v and 8.3 amps We have two bulbs which are 90w / 12v / 7.5 amps and they are connected in series so they should be 45w / 6v / 7.5 amps (from my understanding. Which power resistor should I choose in order to achieve the 99.6 power supply being able to power up the bulbs? Thanks in advance, this is invaluable help for me :)
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