I was wondering does a LL65K need a fan in order to run because i was going to test it and i dont want it blowing up in my face LOL and if i cant run it without a fan how long is too long to run it without one

Also i have a wierd question the LL65k has 2 vacume tubes and i was wondering it you could run it with the outer glass taken off to make it smaller

[1] I definately do NOT know the answer to this. BUT I'd say, just stick a house fan near it when you test it, it should provide more than sufficient cooling (if the bulb does need it), shouldn't hurt anything (if the bulb doesn't need it), and is usually pretty easy to do (assuming you already have a house fan).

[2] Probably not. I think arizonavideo broke the outer envelope on one of his lamps on purpose once. The inner envelope broke with it. He speculated that the pressure in the inner and outer tubes had some kind of balance, breaking the outer tube disturbed that balance and caused the inner one to break too... (makes sense to me).
...
Wait, it was either that, or the inner bulb still worked, but it produced ozone like crazy and he was forced to turn it off...... I'll do a lil' searchin' fo' you...


As a side note, if you do choose to break the bulb on purpose, do a little research about the poisonous gasses that are inside the bulb, and how to deal with them...

Thanks for the input but i wasnt goint to throw it on the ground to get it out i was goung to use a glass cutter it wouldent be a clean cut because the tube is either has pressure or a vacume i have no clue but what i dont understand is where did the ozone come from. If its inside the tube ill just break it outside but if its being produced while running the arc tube itself then where does it come from. I guess ill just put a box fan on the lamp to cool it off when i test it to be on the safe side.

PS: the LL65K does it use an ignightor or is it optional

I believe all (or at the very least almost all) of the lamps we commonly use do not require active cooling to function properly. It's just that our other projector components require cooling. If one can effectively isolate all the nasty components (UV, IR) of the lamp emissions from the rest of the projector you could allow your typical metal halide lamp to run very hot. The typical luminaire in which they reside for commercial lighting applications is not actively cooled. I believe it is actually possible to overcool a lamp and reduce the brightness a little bit. Hope that helps.

Under NO circumstances remove or cut the outer glass from a lamp.

the reason ozone is created, is because the inner jacket is quartz and when you have a U/V source this causes ionization of the air molecules,,

they use this process in sterilisers,, Quartz+U/V = ozone

the balance of pressures is not a factor

the zone inbetween is evacuted of air, sometimes has an inert gas to stimulate other emission lines,,

and also there can be a visible getter coating to solidify air molecules,, often seen in vacuum tubes from past,, hence the silver looking coating

also active cooling on lamps is very detrimental to there correct operation, and also has a severe reduction on thier longevity,,

It is better to deal with facts than myths,, errors are born of this...

Thank you all for the input very much apriciated but one of my questions is still unanswerd it was if the LL65K uses an ignightor for the ballast i heard some lights needed them sorry for the inconveince LOL. I lack knowledge in high powerd lighting also im alittle confused is metal halide another term for mercury vapor or is it a whole other light.

The LL65K is a probe start lamp (M59). It uses an M59 ballast, which does not require an ignitor... or of course you can use the LL eballast.

cheers,
gs

I'm pretty sure they're two different light technologies.

well what would happen if you hooked a ignightor/starter to the LL65K would it just flicker or just kill the lamp. do the balasts need cooling fans even if its not near the lamp just as long as i make air vents for it. On my ballast i have all positive leads wheres my negitive at is it the ballast frame.