HPS 400 sufficient ? ... heat ?

I cant say for sure ... this is the first time I got specific about the 'color' of my lights ... I know this sounds wild, but I must have the world's best luck, because since 1977, I just bought the cheapest flouro tubes I could find, I would guess they were all 'blue' spectrum, these reds' look differently than I'm used to ... here's a real kicker: I have only had ONE male plant develop in my life ... so far ... hope I don't jinx myself ... this is also the first time I ever bought seeds, I always just used the seeds found in half-decent bags of street weed, only had an indica one time, all others just happened to be sativas, judging by their looks ... but I always had quality smoke from those grows, just not big on yield ... :smokin:

i am using a 400w HPS in a cool tube. i jigged up a stanley fan, and i can touch the glass and it's warm at best.

i have a thread in this forum with pics. Using MH for veg, and HPS for flowering.

hi...if you want a reference from a beginner who had to work with limited resources:

It sounds like you have ventiliation under control, but I didn't...

In an unheated bedroom, when the outside winter temperature in Northern California was in the 50s and low 60s, it ran anywhere from 78 to 82 degrees a foot or more under my 400w lamp.

When the outside temperature was unusually warm, in the 70s, the closet temperature pushed 90...all depending on how much the doors were cracked.

I had two oscillating fans, one angled over the top of plants and back toward the bulb, and another placed right next to the light, blowing heat away from the unit and back into the bedroom.

2 other possible factors building heat:

I switched to a MH conversion bulb with great results, but more heat
I used an Econogrow Mini with a built-in ballast, so heat was hard to dissipate.

It sounds like your setup should give you lower temperatures than I had.

And, as far as hanging distance, I kept mine 12 - 18 inches above the tops.

"Here's where my future quote will go"

I agree totally with N.A.T.S. The room temperature has a dramatic effect on the inside temperature of your box. If the cabinet is drawing cool air, you would be okay. But if your room temperature is too high, like a little uncomfortable for people, then the inside of your cabinet could reach high
90's and even more. Been there Done that, but caught it in time before any major trauma affected my WW children. WHEW!

thanks for your response, but this is an OLD thread, things are already done now ... all is well :smokin:

All right, an abbreviation to N.A.T.S! Just when I thought I was going to have to re-register with a shorter handle! Thanks, louisville97! :)