how many days roughly does a hps last on 12/12 or 18/6??

oh fuck off dick head stop stalking me u freak go and wind sum1 else up little girl id smash your fukin face in good prick, and below average iq lmfaooooo you know nothing monky boy, if you cant understand my writing then fuck off simple as that

brewing said:

go away monkey boy no1 likes u on this thread so tata do 1

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brewing said:

'LOL' dead funny u are pal just fukin do1 u muppit

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brewing said:

oh fuck off dick head stop stalking me u freak go and wind sum1 else up little girl id smash your fukin face in good prick, and below average iq lmfaooooo you know nothing monky boy, if you cant understand my writing then fuck off simple as that

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Now get ready for a heavy dose of hypocrisy.

brewing said:

fuck off you complete set of bastards i cba with your bitchy and petty comments

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LOL

blah blah blah fucking muppets

Wow Children, Really?Both of you need to relax...SMOKE A FKN BOWL!

its that child monkey boy getting thrills from winding people up the fucking lil bitch, just do1 like i asked on page 1 ffs take the hint n stop stalking me n trying to wind me up just because its giving you some sort of perverted thrill

As I was saying ..... Bulbs last for years, especially ones made by Phillips.

LOL

HighLowGrow said:

If you don’t know the difference between “there”, “their” and “they’re” your a moron.

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And if you don't know the difference between your and you're?

LOL Sorry HighLowGrow

dbkick said:

It's not just about cost of the bulb, how do you dispose of your bulb? do you take them to some hazardous waste site or just toss them in the trash and they end up broken in some landfill? what happens if everyone everywhere uses everything to 1/4 of its life then tosses it? Probably be more of a polluted up world than it is right now eh?

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the few bulbs growers dispose is negligible in all actuality...what about the thousands from warehouses? think companies will spend the money for proper disposal? NOT...

the only way to know and not guess is with an ACCURATE light meter...which are not that expensive...$100 or so...same as those overrated hortilux hype bulbs


http://www.dasdistribution.com/products/lm-high_accuracy_models.htm#UV

brewing said:

go away monkey boy no1 likes u on this thread so tata do 1

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But I like Moe...oh...guess that means I am nobody

This actually turned out to be a useful thread for me. To bad for the sour grapes. It seems snarkieness or condescending comments. Chalk it up to ther upbringing. My mom taught me to keep my mouth shut when I dont have something positive or constructive. No one likes an asshole. Like I said, glad someone already did the math. 3 grows then a new bulb. So far I am on my 3rd flower, 4th Vegg, plus I have a couple plants in my backyard. I am pretty hard on my bulbs and seem to have to buy a new one every 6 month because I brake them.lol. I have a 250 halide, bought a new bulb last month, a 400w halide/hps. In 6 months I am on my 2nd halide still got my hps. My 600hps I just bought the whole system 4 months ago. I got like 10 boxes of different lights. haha. smoke on men.

Moebius said:

And if you don't know the difference between your and you're?

LOL Sorry HighLowGrow

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That was intentional. At least you caught it.



So I've been using the basic 400 hps bulb from HTG Supply on my last 3 grows. Yesterday I walked into the flower room and the light just didn't look right. The brightness just wasn't there. I have no backup bulbs. So today I made the executive decision to purchase a Hortilux 400w HPS bulb from the local grow shop. $85 Hope I made the right decision, otherwise I'm going to have to fire myself.

I now have a backup bulb.

Hortilux 400w HPS. I have the same bulb, except I use my 400 light as a halide. I actually do not know the age of my Hortilux bulb. That light and ballast was given to me. I should probaly buy a new one, except I dont flower that often with this light. How many of u have more than one room. I have one plant in each room. I get 4-6ozs. off a plant. Buit when i grow 2 plants I get less. So I grow one plant at a time. I have a clone from a dispensary, 1 vegg, 1 flower.

People may not believe me, why should they? But this is from the American Electric Company and its scientific.

http://www.americanelectriclighting.com/Library/Literature/PDFs/HPS Servicing Guide.pdf


HPS Lamps
HPS lamps have excellent lumen maintenance (Figure7A). HPS lamps still are generating 90% of initial light output at the midpoint of their life span. Lumen maintenance at the end of life still is excellent at around 80%. Mercury Vapor Lamps The graph in Figure 7B covers the lumen depreciation curves for a range of mercury vapor lamp wattages. Maintenance of most types falls in the darkly shaded area. Frequent starting or lamp burning position has very little effect on mercury vapor lumen maintenance. Metal Halide Lamps As the graph in Figure 7C shows, the light output of metal halide lamps declines more rapidly than either HPS or mercury vapor lamps. Frequent starting will shorten metal halide lamp life.

HID LAMP LIFE
The rated average life of HID lamps is the life obtained from a large group of test lamps burned under controlled conditions at 10 or more burning hours per start. It is based on the survival of at least 50% of the lamps or groups of lamps and can vary considerably from the average. Factors affecting HID lamp life include: lamp operating wattage, lamp operating temperature, ballast characteristics, line voltage and
burning hours per start. Lamp age, or the number of hours a lamp has operated, has very little effect on lamp startability, although metal halide lamps can require longer starting times as they age.

HPS Lamps
As shown in the lamp survival curve in Figure 8A, HPSlamps have a long average life span of 24,000 plus hours. Normal end of life occurs when the lamp begins to cycle on and off due to excessive lamp voltage rise.




The graph above shows that a bulb will have around 90% of its lumens output after 12000 hrs of useage. Thats 1000 days running at 12/12. Thats after 2.7 years of a bulbs life it will have 90% output.

Basically, people throwing out their bulbs after 3 grows are discarding a bulb with around 98% of it initial lumens output.
Worse than that .... I can provide evidence (when I find it) that a bulb doesnt even reach its peak lumens output until several months after its been used. If you still dont want to listen, you really need to buy a tester and do the work yourselves.

Moebius said:

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looking at your graphs its hard to believe the bulbs peak after several months, they start out at 100% and only get worse, if you buy a bulb for £15 (or less) every grow you would always be riding above 98%, thats not a big price to be relatively guaranteed lumens and performance from a bulb.

been looking at getting a CMH bulb to try ,they put out constant performance throughout their lifespan, and they dont give off much heat, mixed reviews though

ineverveg said:

looking at your graphs its hard to believe the bulbs peak after several months, they start out at 100% and only get worse

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The graph above does show a linear depreciation in light output. True.

All I can say is that Ive seen evidence contrary to the graph I posted myself....LOL.... It was years ago, I believe it showed that bulbs didnt start with 100% lumens output but achieved this sometime thereafter. Without reference, that detail remains anecdotal and the above pdf and graph should stand on its own merits.

Moebius said:

I can provide evidence (when I find it) that a bulb doesnt even reach its peak lumens output until several months after its been used.

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The above statement I'll retract ... The 'evidence' I was thinking of shows initial lumens rating after several days not after several months.

VARIATION OVER OPERATING LIFE
During the first 100 hours of lamp operation (referred to as lamp seasoning), the halides are blending together for the first time and will display even wider color variation than when they reach their stable operating point beyond 100 hours. At about the 100-hour point, the halides are sufficiently mixed so that infant variation is minimized.

LUMENS — LUMENS LISTED ARE REFERENCE LUMENS
Rated average lamp lumens are obtained under controlled laboratory conditions in a prescribed burning position. Initial Reference Lumens refer to the lamp lumen output after 100-hours burning. Mean Reference Lumens refer to the lamp lumen output at the mean lumen point during lamp life. The mean lumen point occurs at 50% rated life for HPS and mercury lamps, and at 40% rated life for metal halide lamps. Lamp performance on typical systems under typical service conditions will vary from the reference lumen ratings.

http://www.geappliances.com/email/lighting/specifier/2008_07/downloads/HIDBurnOrientation.pdf

I have allway's replaced the lamp after 2 grow's never had a problem....what's your crop worth??? you can be frugel but you CAN'T BE CHEAP! quality bud quality lamp! you can't make chicken soup with chicken shit!

They last for years if kept in good condition , however apparently the longer they are used the less potent they are or somethign liek that.

I would personally replace them after every crop.

Personally, I think the answer is going to be different for different people.
Variables will be....
Cost of electricity.
Cost of bulbs.
What your crop is worth.
What I,m trying to say is if your bulbs are $10, your electricity is $1/KwHr and you are producing 2 Kilos every crop, it makes a lot more sense to change every grow than if your bulbs are $100, electric is 2 cents and you're getting an ounce a grow.