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I found this interesting. I'll have to harvest a lot earlier then - or I would get.... dead amber... ;-) (BTW: I got two different answers above, both cannot be true).

Try cutting of a small sample, then study the trhics outside your growroom on a white piece of paper. It can be hard to study trichomes under HPS light, the thricomes are reflecting/refracting HPS-light (and your environment).

What do you mean, PoppaDoc? Anyone have an answer? I know the question sounds stupid, but now I'm curious.

Yes, I believe it's the same thing. Amber is amber. From personal experience, a LOT of cloudy trichs will turn amber during curing. However, I don't know this for a fact - maybe milky thrics that become amber during curing is not "true amber"? Anyone else?

The plants can't handle more than X hours, then droop? Sounds like too much light (or more correct, too little of something else).

Leaves also can suddenly - we are talking hours - "claw" like that when they get more water than they bargained for.

Lockouts are hard to diagnose, especially online. Could be cold roots at night (less than 19c), nutrient-ratio lockout, or simply the good old PH-lockout. It is probably related to flowering, as you are only 2 weeks in. Did it look healthy at the start of flowering? Is this the only plant...

Maybe you gave it too much N? (which could make it struggle to feed because of nutrient-ratio inbalance in your medium. But this lockout could be because of PH too, of course). Also, you say you are 4 weeks into bloom. At this stage, a lot of plants crave for Mg, I give mine Epsom salts around...

I have two identical inline fans in serial. This makes them twice as strong, but not any faster, exactly what I needed to suck air through my Carbon Filter (it had to much restriction for my single fan). Might depend on the fan though, I don't know. Mine are designed that way (S&P TD 100), so...

@Dako: Light is "absorbed" by the DISTANCE (travelled) itself! Your qoute about "energy levels" doesn't make sense because of this, because the energy fades simply because of distance - and it fades incredibly fast. Even if mylar reflected 100% there would still be a loss, after a couple...

It IS a myth, but it's a myth that has recently been researched, and there seem to be some thruth to this myth. Sorry for no source, I don't remember where I read it. Anyway, IMHO, the plant is not harmed by 24 hour darkness before harvest, so why not do it?

I'm not sure what your're asking about, if it is simply 250 vs 400 watt, and your space, then: 250 watt hps: Area covered (horizontal reflector) is about 61 cm x 46 cm (2 x 1.5 feet). 400 watt hps: Area covered (horizontal reflector) is about 90 cm x 61 cm (3 x 2 feet). Source (and more info)...

Because of the very cold & dry weather, I fill buckets with HOT water from the tap, and put in my grow room. This will increase RH nicely, but I'm wondering.... does the chlorine harm the plants as the water evaporates from the buckets?

This looks like P-def to me, for whatever reason (PH, feeds, I don't know). Just an opinion.

I find it hard to believe yellowing is natural as soon as you switch to 12/12, where do you have this info from? A strain is not a separate species you know, it's all a plant. The last thing newbies (I'm talking about lurkers) need is wrong facts.

If you're in flower, looks like P-def to me. But there is something else wrong too (IMHO), so I say a lockout (due to PH or nutrient-ratio, or no micro-life).

Bump... I would like to know this too. Does a higer watt CFL bulb like 125 Watt penetrate deeper than lower watt CFL's? Or is this the big drawback of using CFL's, they simlpy don't penetrate even if you have 250W?

OMG, I'm tired of this cal-mag hystieria. But this time, I agree, somehow your plant can't get enough Mg & Cal, due to lockout (nutrient ratio unbalance, or PH is off), or if you'r lucky simply too little nutrients.

@Dako: Light traveling any distance DOES reduce "potency". (It HAS somewhere to go, you can't reuse light.) Light bouncing around the room because of mylar doesn't help that much. I read somewhere that Mylar, in a closed space, adds about 2% usable light to the plants, but I have no...

Keep in mind, how much light the pants tolerate during dark depends on the wattage during lights on! (It's all relative) So if you're using say 250W, the plants will not tolerate as much light leak as plants used to 1000 Watts. It's like the moon, relative to the sun.