Rg it's good to know there florecent did not know that and did not know there on a pully set up.. . Ya used 18 inches most use 18 inches like... hps Mh and led lights sources... now florecent are low heat in the t5's, t8's, and t12 bulbs and can be placed less then 10 inches from plants.. like you said.. by the way I am sure you noticed mylar has more light reflexing then the duller finish of reflectixs.. that's why i use it by the way temps are a tad cool seems but if it works it works was not sure if basement was heated or not that is why I suggest the heat pads..
Any how cool stuff on lights:
th the light, here's a quick reference guide:
Type of LED Grow Light Distance From Plant
1W Bulbs at least 12" (30cm)
3W or 5W Bulbs at least 18" (45cm)
High Wattage (300W+) up to 30" (76cm) or more
Powerful LED grow lights need to be kept further away
guide to use as a starting point:
Grow Light Closest ~ Sunlight Furthest
150W 8" (20cm) 10" (25cm) 12" (30cm)
250W 10" (25cm) 12" (30cm) 14" (35cm)
400W 12" (30cm) 14" (35cm) 19" (48cm)
600W 14" (35cm) 16" (41cm) 25" (64cm)
1000W 16" (41cm) 22" (55cm) 31" (79cm)
150W - covers 2' x 2' (0.6m x 0.6m) area
250W - covers 2' x 2' (0.6m x 0.6m) area up to 2.5' x 2.5' (0.8m x 0.8m)
400W - covers 3' x 3' (0.9m x 0.9m) area up to 3.5' x 3.5' (1m x 1m)
600W - covers 3.5' x 3.5' (1m x 1m) area up to 4' x 4' (1.2m x 1.2m)
1000W - covers 4' x 4' (1.2m x 1.2m) area up to 5' x 5' (1.5m x 1.5m).
Exampleth the light, here's a quick reference guide:
Type of LED Grow Light Distance From Plant
1W Bulbs at least 12" (30cm)
3W or 5W Bulbs at least 18" (45cm)
High Wattage (300W+) up to 30" (76cm) or more
Powerful LED grow lights need to be kept Compact fluorescent bulbs are available in warm/red (2700 K), full spectrum or daylight (5000 K) and cool/blue (6500 K) versions. Warm red spectrum is recommended for flowering, and cool blue spectrum is recommended for vegetative growth. Usable life span for compact fluorescent grow lights is about 10,000 hours.
Grow
Nice link on lumen out put of all type of bulbs..
http://www.littlegreenhouse.com/guide3.shtml