days, weeks, months, years?
venture, are they any good?
i find the cheap grolux bulbs burn out real fast sylvanna grolux worst bulbs ever
the regular spectrum osram and philips bulbs last for years
i am using the philips adjusted spectrum PIA green power bulbs they seem good sofar, not sure they are worth the extra cost over regular sodium's though
if you only have 1 or 2 lights changing the bulbs when they lose 10% of their lumen output is possibly a good idea they should still last several crops before they lose any output at least a year of use on 12/12 .. i have bulbs that are about 4-5 years old working perfectly
if you have more than 1 or 2 lights losing 10% of the lumens would make little difference to the overall output if you have plenty of light on your crop to start with
a light meter would give you all the answers you need, you can rent them from photography stores etc they are quite expensive to buy
OG Raskal Fire Alien Kush Karma Genetics Happy Brother bx2 http://www.rollitup.org/grow-journal...ml#post9087434
3grows and get new bulbs...simple as that....keeping them years.....he he lmfao........... so dam funny
i might be mr rollitup in drag............
Do the math...If a bulb is rated at 10,000 hours, 60 days of 12/12 is 720 hours or 7.2% of the bulb's life. 3 grows and you are at approx 78.4% bulb life, if the numbers were accurate to begin with.
So guys, what is the least % do you want to grow with? I think unlucky is right...after 3 grows I might send the bulb to the veg room or use it as a side light and not a main overhead grow light....IMHO.....or you can just keep using them and be mindful of how well the crops are growing. Good question
Enjoying other people's efforts since 1964 and honestly, all posts by this user should be considered fictional and are for entertainment use only. Anyone reading these posts should be advised that aliens brought us weed from their home planet.
like unlucky said 3 grows then ill change thats all i needed to know, keep your sarky comments to yourself monkey boy
24,000 hours. This is the average life of the bulb. 5.5 years of 12/12. The bulb would lose alot of it's usefulness by then. I think 24,000 hrs is when the bulb burns out.
Here is one I plucked off a site.
Sylvania LU400/ECO EPA Compliant 400 watt mogul Base HPS Lamp
- Operates on S51 HPS ballast
- Universal burn position
- Meets EPA TCLP criteria for non-hazardous waste
- ET18 clear bulb with brass mogul base and glass insulator
- Lumens: 50,000 initial - 45,000 mean
- Rated average life: 24,000 hours
- 2100° Kelvin color spectrum for flowering and fruiting growth
- 1-year warranty
Doing my best with my room waaaaayyyyy out there in the not so insulated, non powered shop, being fed with a big fat extension cord.