Jimster
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I understand the risks. I know how halide and HPS work and the theory behind them, and I know the glass is on there for UV filtering. You can see when the different compounds inside the arc tube get vaporized, often with a red or yellow flash, depending on the mix inside the tube. Often, the metal balls are mercury, while the halide materials are the yellowish deposits inside the arc tube. There are 3 varieties of UV, as I'm sure that you know. Different formulas of glass allow different frequencies of UV to pass, or not pass. UVC is filtered almost totally by the glass, UVB mostly filtered, and UVA isn't usually filtered too much, like car windows. Your side and back window allow a ton of UVA, but your windshield stops most of it. I'm curious as to the amount of the different UV permeability depending on the glass being removed or left on, as well as the composition of the glass. More Iron = less UV transmissions, but it varies between UV-A, B, and C.Sorry, but ALL metal HID bulbs come in a glass enclosure. Its required by the CPSC and other agencies for safety reasons. I'm sure MIMedgrower misunderstood the question...
Its for UV filtering, and to stop burn potential, and protect from the 'dripping' of halide from the element. You can see often those balls of halide rolling around inside the glass - and they (I think) usually vaporize again when the bulb gets up to temp. I trust EYE Lighting and I think they have a full tech explanation on their site.
But don't do it buddy... ain't prudent at this juncture... heh...
If you look closely, the "protected" ones actually have a small metal cage built around the arc tube, as the outer glass shell wouldn't provide much protection in the event that the arc tube went tits up. You are correct in the double jacketed ones are meant for open fixtures, but one jacket is glass (outer shell) and the other is metal. The arc tube itself is quartz, which lets all the UV get thru. I always assumed that the enclosed light reflector units were mainly for keeping things cool and easy to tie into the vent systemThere are single and double jacketed bulbs. That is what determines if they can be used in an open fixture. Even though growers use mh in open reflectors most warn enclosed fixture only.
Hps use double jackets and thats one of the reasons mh gives more uv.
If you look closely, the "protected" ones actually have a small metal cage built around the arc tube, as the outer glass shell wouldn't provide much protection in the event that the arc tube went tits up. You are correct in the double jacketed ones are meant for open fixtures, but one jacket is glass (outer shell) and the other is metal. The arc tube itself is quartz, which lets all the UV get thru. I always assumed that the enclosed light reflector units were mainly for keeping things cool and easy to tie into the vent system
But, then again, I'm a daredevil! I even use a bulb that says horiz Burn Only, in a vertical position! Wild, I'm telling you! I once found a damaged leaf on one of my plants... and did nothing about it!!
Totally wild, I tell you!! :cool::cool::cool:
The HPS arc tubes actually have a lot of pressure in them when they are burning. The arc tube structurally is much stronger than the ones in the MH bulbs, but the area os pretty small compared to MH. There are also the Low Pressure Sodium bulbs that are much yellower in color and, like you said, have low pressure in them, sort of like a neon bulb. The HPS need to heat up high enough to vaporize the sodium inside, which raises the pressure much more than MH. Don't get me wrong... MH also generate pressure, but it isn't quite as high as a HPS. I think the difference is the way the sodium reacts VS the halide, which doesn't have such a pressure increase. For whatever reason, the sodium lamps require a much more confined are space and higher pressures to work properly... the tubes inside are pretty tough!Yeah Explosions. HPS are under vacuum so when they pop they just kind of implode into pieces.
The HPS arc tubes actually have a lot of pressure in them when they are burning. The arc tube structurally is much stronger than the ones in the MH bulbs, but the area os pretty small compared to MH. There are also the Low Pressure Sodium bulbs that are much yellower in color and, like you said, have low pressure in them, sort of like a neon bulb. The HPS need to heat up high enough to vaporize the sodium inside, which raises the pressure much more than MH. Don't get me wrong... MH also generate pressure, but it isn't quite as high as a HPS. I think the difference is the way the sodium reacts VS the halide, which doesn't have such a pressure increase. For whatever reason, the sodium lamps require a much more confined are space and higher pressures to work properly... the tubes inside are pretty tough!
The industry is still young... sooner than later there will be new laws and ordinances that make it a pain in the ass to do anything. Mandatory eye protection, respirator masks, someone will sue the industry after eating 5 lbs of buds and having a bad trip... it only takes 1 lawyer to screw it up for everyone. Never underestimate authority, it creeps into every crook and cranny in society, like a beer fart.Meant to add we had those Maxpars in 2 rooms and he was ok with those. The other place he shit a brick about the 30+ open hood SE MH's in the veg room.
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