Today's update. It has been 11 days since ground breach.
And here was my last grow at 12 days.
I may leave the seedlings a bit longer this time under the t5 lighting before going in the upper chamber.
This is because my 2ft 8 bulb t5 fixture pulls only 153 watts at the wall. This saves me some cash and heat production (it is now summer, gotta keep heat and A/C useage down). Also with an approximate value of 2000 lumens per bulb (8 bulbs=16,000) divided by the 4 cubic feet of airspace in the lower chamber equals=4k lumens per cubic foot.
So it has a low electrical draw. While still producing a high lumens per cubic foot environment for them to begin the first stages of life. Just makes sense for me to leave them in there as long as possible (for efficiency).
As of today my kill-a-watt strip has recorded a tent total of 29kwh ($.06x29=$1.80)
My 400watt mh/hps pulls 430 watts at the wall. That is a %281 increase in electrical draw at the outlet when compared to my t5 fixture.
The increased efficiency of lumens produced is higher for the 400watt lights. As well as the par value is much higher. So it is a better light overall. Just better suited to larger amounts of vegetation. If used on seedlings much light/electricity would be wasted/excessive.
The only downside to my veg chamber is. Since it is such a small space with high lumens per cubic ft. It gets pretty warm. °85-°87 with exhaust fan cycling air. The the seedlings will only get so much vertical growth before encountering the heat being put off from the bulbs. Then the leaves will show heat stress and vpd problems.
This is the point where they will be transitioned to the upper chamber.