whats up with the 1500watt mh

[DIGITALHIPPY]

why dont people use these? there not that expensive..

 

[rastagrass]

the reason ive heard that people dont use them is because they are too hot and also they cost a lot more to run and dont really add that many more lumens. or something like that.

 

[BonsaiBud]

I got an old book at the library titled something like: "growing pot indoors with HIDs". It had lumen maintenance charts and simple SPD bar graphs. C 1979 or so. It spoke of these; at the time, they had very short lifespans compared to the smaller ones. Also, not enough light energy in the photosynthesis bands of the spectrum...just some guesses.

 

[DIGITALHIPPY]

http://www.1000bulbs.com/1500-Watt-Metal-Halide-Lamps/
161,000 lumins isnt too bad if u ask me.
i wonder if the size is right, for 25$ there hella cheap too.

 

[clowntown]

I also recall reading that they have a very short life span relative to other major wattages of HIDs, and aren't used very commonly. And I suppose there aren't really that many applications that require that much intensity to make 1500 watters a common thing.

 

[guineapig]

Mainly they are used for very high ceilings and stadium lighting......

The old Ed Rosenthal book cited bulb life and excessive heat......one other thing i noticed is all the reflectors descriptions which include the warning, "Not compatible with BT-5031," and you find out that "BT-5031" refers to the huge 1500 watt MH bulbs.....

Its unbelievable how huge the outer shell of this bulb is......really, really large!!!

I have to admit, though, if you were to start the "1500 watt MH fanclub thread," i would for sure be a-lurkin'.....

kind regards from guineapig

 

[clowntown]

I think I asked this question before without getting a response, but... what purpose does the outer shell serve, exactly? Of course protecting the arc element from dust, small pieces of debris, etc... but why the many different shapes and sizes?

From the size of the outer shell of the 1500w it would almost suggest that it partly serves to limit how close any object can safely get to it... but I just have a feeling that's not it since I don't see manufacturers wasting the extra glass, manufacturing resources, and logistics resources for that feature...

 

[MickeyBlue42]

Shorter bulb life
Excessive heat ----) means you cant put them close... light diminishes very quickly therefore the extra lumens cant really be used so it cancels out the +ve's

Sure would be cool to see that shit operate though!!

 

[PharmaCan]

I think I asked this question before without getting a response, but... what purpose does the outer shell serve, exactly? Of course protecting the arc element from dust, small pieces of debris, etc... but why the many different shapes and sizes?

From the size of the outer shell of the 1500w it would almost suggest that it partly serves to limit how close any object can safely get to it... but I just have a feeling that's not it since I don't see manufacturers wasting the extra glass, manufacturing resources, and logistics resources for that feature...

The glass also acts to keep the bulb airtight. There's either a vacuum (no air) or perhaps some type of inert gas inside the bulb, but no oxygen. If there were oxygen, the bulb would burn out in a few milliseconds.

PC

 

[clowntown]

The glass also acts to keep the bulb airtight. There's either a vacuum (no air) or perhaps some type of inert gas inside the bulb, but no oxygen. If there were oxygen, the bulb would burn out in a few milliseconds.

This is not true, at least on your typical MH / HPS HID bulbs. (It is true in fluorescent tubes, however.) Additionally, MH / HPS does not use a resistance filament (like that of halogen / incandescent) to provide light, so this "burn out in a few milliseconds" doesn't really apply.

The glass shell does not provide a vacuum, and is filled with the surrounding air. Take a look at the base; on most bulbs, there are holes in the resin or ceramic separating the +/-, which allows air to easily flow from inside and outside the bulb. I think a particularly good example are EYE Hortilux bulbs... where the white ceramic has two obvious holes.

The arc tube, on the other hand, is air-tight and possibly in a vacuum filled with noble gases & metals.

 

[DIGITALHIPPY]

ok so ive been looking the life is a tad shorter 3,000hours vs 9,000-12k hours.
but were supposidly changing our bulbs every 3-4 harvests anyways... lumins do diminish on any bulb is a matter of how much.
ok enough of that.
[1500w mh]

BT56 Bulb - E39 Mogul Base

[1000w mh]

BT56 Bulb - E39 Mogul Base

so itll fit into a standard hood. so if its hotter i wonder if the 8" hoods[radiant 8"] will cool it better, thoes didnt exist when ppl talked smack on these bulbs.

with 160k lumins u could do a 5x5' and think of the penetration too. i wouldnt mind getting fat lower buds also. the MH spectrum reduces strech also.

can anyone tell me how to wire up a ballast core to a plug and hood...?
I wouldnt mind making one of these.

if it dont work ill throw it in the corner with my other failed projects...ive wasted a c-note on dumber things.

 

[DIGITALHIPPY]

This is not true, at least on your typical MH / HPS HID bulbs. (It is true in fluorescent tubes, however.) Additionally, MH / HPS does not use a resistance filament (like that of halogen / incandescent) to provide light, so this "burn out in a few milliseconds" doesn't really apply.

The glass shell does not provide a vacuum, and is filled with the surrounding air. Take a look at the base; on most bulbs, there are holes in the resin or ceramic separating the +/-, which allows air to easily flow from inside and outside the bulb. I think a particularly good example are EYE Hortilux bulbs... where the white ceramic has two obvious holes.

The arc tube, on the other hand, is air-tight and possibly in a vacuum filled with noble gases & metals.

good of you to point that out. i didnt know, just looked ITS TRUE!

the glass provides a protective cover. <-- my guess

 

[clowntown]

I'd love to see it in action!

 

[clowntown]

the glass provides a protective cover. <-- my guess

For sure; but why so many different sizes and shapes? For instance... you can get a 1000w MH bulb in maybe 3 or 4, possibly more glass sizes, even from the same manufacturer! I have two 600w MH bulbs... one has a cylindrical, tubular shell like a HPS bulb, except with a slightly larger diameter "pregnant bubble" in the center where the arc tube is; the other one has a much larger shell, similar to that of an EYE Hortilux Blue. And I know for sure I've seen even different glass sizes / shapes yet. What difference does it make?

 

[DIGITALHIPPY]

For sure; but why so many different sizes and shapes? For instance... you can get a 1000w MH bulb in maybe 3 or 4, possibly more glass sizes, even from the same manufacturer! I have two 600w MH bulbs... one has a cylindrical, tubular shell like a HPS bulb, except with a slightly larger diameter "pregnant bubble" in the center where the arc tube is; the other one has a much larger shell, similar to that of an EYE Hortilux Blue. And I know for sure I've seen even different glass sizes / shapes yet. What difference does it make?

my 600W MH conversion is like that, or maybe thats the glass envelope that sunmaster uses. or for that type of bulb. its more about the type i noticed. although there is veriance. probably temps dosent it need a certin temp just to create the spark? yet if its too hot it might need to cool.

the ballast isnt that bad 177$...+
only pulls 6.5 amps i was figuring it would draw 7.5...
http://www.1000bulbs.com/1500-Watt-Metal-Halide-Ballast/32960/
i need to gather up some cash so ill have to wait a couple months but i might get this done at some point.

 

[AzGrOw-N-sMoKe]

man i would love to watch a 1500watt mh grow...dreamers we are...the heat from that seems insane..just my 2...peace az

 

[MarquisBlack]

I think I asked this question before without getting a response, but... what purpose does the outer shell serve, exactly? Of course protecting the arc element from dust, small pieces of debris, etc... but why the many different shapes and sizes?

From the size of the outer shell of the 1500w it would almost suggest that it partly serves to limit how close any object can safely get to it... but I just have a feeling that's not it since I don't see manufacturers wasting the extra glass, manufacturing resources, and logistics resources for that feature...

My guess would be that the outer shell assumes different shapes as a means to control surface area for dissipating heat. Maybe the 1500w has a proportionally larger shell because it runs proportionally hotter and needs the extra surface area to avoid over heating.