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to get results which you can relate to your setup and to learn from it: stick to your current setup.

lol I'm not arguing with you polyarcturus, I wanted to say (and agree with you) that indeed they do (or at least should) specify the suitability for open fixture or not. I understand that you understand that a MH is very dangerous when the glass breaks. Adding to that I just wanted to warn...

They do! Call Holos.

Remember for the Pro 600 you need the special high frequency Philips lamp. It does not work with normal voltage HPS lamps.

Manufacturers will specify whether the lamp is suitable for open fixture. A much worse accident would be when the outer bulb fractures and the lamps does not extinguish. You will get huge amounts of UVC which is normally blocked by the outer bulb. See here and here for example.

You can never really see from the glass if it is blocking UV or not, sometimes it is specifically mentioned. But very important is that MH or CMH rated for open fixture have a double glass envelope, or a cylinder of glass around the arc tube, or a wire circling around the arctube, or even...

Many MH lamps are NOT rated for open fixtures! Take good care of selecting the correct lamp. When placed behind (normal) glass filters, you will lose the UV they might emit. Stay away from any UV LED that are not made of glass.

:D that "tiny security light reflector" that you mention is a horticultural miro aluminum reflector that is hand made and has an efficiency of 96%. Is it one of the most efficient reflectors in the horticultural market. But if you would choose to use a parabolic reflector or an air cooled...

UVA and UVB has a significant influence on plants. Not only the thickness of the leafs and morphology are influenced, but also the levels of terpines, flavonoids and cannabinoids. The trichome is the only part of the plant that actually absorbs this high energy radiation. Have a look at plasma...

For a 600W 50-60 cm is ideal in a one lamp tent. I measured effective about 240 m3/h air flow. Environmental temperature outside the tent is about 20-23 Celsius, tent temp is about 27-28 Celsius max using all passive intakes. Later in the grow, in the last week, I hang it a bit higher sometimes...

here is a Gavita Pro 600 is a 1x1m tent (a bit more than 3x3'). No problem at all :)

LEP generates UVC, but indeed that is blocked by the glass filter. However, you have UVB and UVA. And though that is not fungicidal it does harden the leafs and make them less perceptible of a fungus infection. For UVC to be fungicidal it needs to be a specific wavelength and a very low specific...

That's a good reference, please take a good look at those PAR readings he did. Now what can we learn from that? You will see that the light is very directional and has a peak intensity in the middle. Even at 18" (which imho is the maximum distance you should use with a single fixture: center...

Philips is only promoting LED for multi layer and as interlight (extra light inbetween the rows), not as primary source of light in a greenhouse. Those experiments have not been very successful so far. In scientific research the trending topics are about full spectrum lighting, the color green...

yes I agree there are some good white LEDs but that is still a phosphor emitter like a cfl, and basically a blue LED. Unfortunately they are not as efficient as the monochrome LEDs and still don't have a full continuous spectrum. Their spectrum is much like the CFLs, which come in multi band...

I personally prefer to use it with HPS. You need efficient wide spectrum reds and you do need heat too, don't forget that. Using two new technologies is not only very expensive, but we have not been able to do a really good combination with LED yet and we haven't seen anyone else do it either as...

hmm.. plasma is not good for your electricity bill yet, as it isn't as efficient in making photons as HPS is. You choose plasma for quality, HPS for quantity, and you use them both. When it is your concern to make a good product then this is not a gimmick, but common sense with a very fast...

I see you are using a "Gavita clone" in your growthread based on a different emitter foreverflyhi, the previous 40.02 series. The 40.xx has a lower output than the now standard 41.xx emitter, but allows universal position. Also I don't know what type of glass filter you use in that fixture...

someone needs to do it...

my 5 cents: might be a combination of fans aimed directly at the plants and evaporating so much they give up, called fan burn. mostly a combination with lamps being short on the crop and low RH, as you are experiencing (30-40%). Which gold label substrate do you use? They don't sell soil but the...