Kooltube Yes / No? 400 / 600??

Mission - enhanced CBD through strain selection and growing techniques (this is a grow built for testing.. a "test lab" of sorts). As you may well assume,, my interests are medicinal,,, but a recreational buzz is good, however, not at the expense of CBDs.

Environment;
40" X 40" x 6.5 ft. tent
14" raised platform that houses a 400 CFM intake
Shirted Lazy Suzan ( I can control air flow between cooltube & grow separately)
3 plants, pot screened to 28 X 44" screens
400 / 600 Solis Tech Ballast & bulb in cooltube (single bulb)
22" filter for 6"
760CFM extraction through duel ducting with adjustable blocks
Fans are speed controlled
Temps stay within 10F (@ 14" w/ 400w) from grow radius to hot point adjacent to bulb

How difficult would the heat be with a 600 w bare bulb?
Would a 600w with cool tube out do a 400w bare bulb?

Glass kills UVb and all.... (suggestions?)

That 600 is always going to put out more than the 400. The 400 again would be fine in that tent, but the 600 would be a noticeable difference in your final outcome. A tube would be a good idea in that small of a tent imo.

600w, no tube, just make sure venting is sufficient. Too much wasted light in a tube.

But if you want to grow vert why are you only using top lights? Vert doesn't make sense with only top lighting, you need 2/3rds of your light to come from the walls if you really want a nice vert. If all the light comes from above you will notice you only get good bud on top.

@nomofatum is on point with his advice. To help rid the tent of excess heat, place a small fan in the middle blowing straight up- on low- and it will push the hot air right up and out, as long as there's a good vent up there.

I run two bare vertical thouies in my Super Silo and with this arrangement I get zero heat stress.

Dialing - in with progressive 3 plant Auto grow. 1 in, 1 out per mo. 400w HPS w/ 18/6 gaslight rotation.

nomofatum said:

600w, no tube, just make sure venting is sufficient. Too much wasted light in a tube.

But if you want to grow vert why are you only using top lights? Vert doesn't make sense with only top lighting, you need 2/3rds of your light to come from the walls if you really want a nice vert. If all the light comes from above you will notice you only get good bud on top.

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Where did "top lighting" come from? I never mentioned anything about horizontal or top lighting.

I'm sorry, I don't understand the point of the lazy susan?

If the whole thing is rotating, aren't the same points on the plants continuously orientated towards the light? Is there a point to rotation that I'm not seeing? Thanks!

I've a bit of a disability (my legs don't work so good). Being able to pull the plants around to in front of me makes life a lot easier.
You're right. Not to rotate the light around the plant. I see no need for that in this style.

Canon said:

I've a bit of a disability (my legs don't work so good). Being able to pull the plants around to in front of me makes life a lot easier.
You're right. Not to rotate the light around the plant. I see no need for that in this style.

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Now I completely understand and it truly would make getting to the plants on the other side easier!

Congrats on your innovation.

Looks good to me- a no brain damage perpetual on a lazy Susan. And here I thought I was rockin' the labor saving innovations!