maybe...
Diamateous Earth, drench 1st. with it in water; then top dress lightly.
you can also spray it on the plants tops and bottoms. won't hurth them& you can rinse it off too.
i use the food grade stuff just in case (but use a mask while working with it in the dry state)
i know you are verting, but come flowertime i'd find away to put those lights in the middle of the plants (height wise). like cage growers do it in their vert grows.
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below is 411 that came from a link on this site.
Controlling Sciaradae
Pesticides: I have found that after using numerous approaches and products (biological and pesticide) the Permethrin based products (Coopex, Axe etc) are the most effective treatment for totally eradicating Sciaradae from the crop. Permethrin is non systemic and and degradates (neutralises) quickly which makes it ideal as it is not up taken by the plant in any way.
The product I typically work with is Coopex WP 250g/kg powder which comes in 25gram sachets. Coopex is manufactured by Bayer and is widely available in most countries. Mix one sachet to 10 litres, hand water (drench) the media and leave for an hour. After this, flush with pH adjusted nutrient and you are ready to go.
Yellow sticky traps hung at media height will trap the adult Sciaradae. This will help reduce numbers. More importantly it will allow you to monitor whether Sciaridae are present in the growing environment.
Tip (About Sciaradae)
Look out for:
Signs of the pest through the use of yellow sticky traps
Deformed leaves and generally unwell plants can indicate an infestation of Sciaradae