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If a high pressure sodium bulb begins cycling (flashing on and off) what do you do first?

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If the lamp itself is old , It could cause the lamp to turn on and off , If it is fairly new , Check the ballast , The lamp must match the wattage rating of the ballast , If you replace the lamp , Please recycle it because it contains alot of mercury , Alot more than the average fluorescent bulb , Go to lamprecycle.org for more information , If the new lamp still turns off and on , Check the ballast , The fixture may have an ignitor and if so , Replace it , Usually a bad ignitor causes the lamp to cycle on and off , Try replacing the ignitor first and then go from there , You may also want to test the capacitor , Here is a video on how to test capacitors
URL http://youtu.be/TFa6JfVu3B4 Good luck I hope you can fix it
DANGER ! , , , , If you accidentally drop a high pressure sodium lamp , NEVER handle the broken glass with your bare hands as it has mercury on it and avoid breathing it's vapor , Not only is mercury poisonous , It is also a strong carcinogen that easily causes cancer , Mercury can enter the bloodstream by touching it with your bare hands , Continued on comments

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Especially if you cut yourself with mercury laden glass . Remember . . SAFETY FIRST!!!
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uhhhhhhh.....maybe turn it off.

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Make sure it is getting enough power.

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The most probable reason as to why high pressure sodium bulb begins cycling could be because there is not sufficient power in the bulb. You need to check it out before you switch it on again.

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check your ballest. check the bulb and check the peice that it screws into.forgot the name? if its not that you might be running to much or to less wattage for the recomended usage. you can't use a thousand watt bulb. in a 6 700 watt max system.

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are you growing pot with that hps light?

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