Are these led lights dimmable?

The cords have an on/off rocker switch built in. Generally this style of LED is not dimmable. Each is individually not that powerful. I am adjusting the intensity by adding and subtracting tubes and adjusting the height over the plants. It is working out fairly well. For an 18" x 48" shelf I am using 3 tubes. I just used these this season for seed starting and those plants were just put in the garden. They worked well.

How many lights and what distance for sowing seeds for 48"x24" flats?

We do not use them for seed flats at this time but will likely do so next spring, These are very bright, powerful lights. I would use no more than two 48 inch per flat. Not knowing your location or setup I do not think that these bulbs will generate enough heat without other supplemental heat.

How far apart in parallel should the lights be placed for growing seedlings?

The height would also need to be considered as for spacing in parallel. 12 to18 inch for approx 12 in height

I bought a six pack of 2' lights. the shelf is 16" x 36". How many 2 foot lights per shelf?

I turned my walk in closet into a nursery. I have 3 long shelves around 4’ in length and 2.5’ in depth. I use 2 lights per shelve. That’s been working for me.

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Barrina 4FT T8 Grow Light, 42W Full Spectrum Grow Light, 6 Pack

Product ID: 740284932

Details

Brand
Barrina
Colour
Pinkish White
Light fixture form
Pendant
Material
Aluminum
Style
Pack of 6

🌈Full spectrum sunlight replacement

💡42W power-efficient brilliance

🔗Link up to 6 lights seamlessly

Description

🌿 Grow smarter, not harder — light up your indoor jungle with Barrina brilliance!

EYE FRIENDLY GLOW - Soft pinkish-white light protects your eyes while creating a comfortable environment for both plants and people.
POWER PACKED EFFICIENCY - Consumes only 42W per light, replacing bulky 1400W traditional grow lights for massive energy savings.
MODULAR LINKABLE DESIGN - Easily connect up to 6 units with included cords and connectors for scalable indoor gardens.
EFFORTLESS DIY INSTALLATION - Comes with all mounting accessories—clips, tapes, cable ties—for quick setup in minutes without hassle.
SCIENTIFICALLY TUNED SPECTRUM - Delivers optimal full-spectrum light tailored to maximize plant absorption and growth at every stage.

The Barrina 4FT T8 Grow Light 6-pack offers a cutting-edge, energy-efficient 42W LED solution with full-spectrum light optimized for indoor plant growth. Featuring a durable aluminum shell for superior heat dissipation, it supports linking multiple units for customizable setups. Easy to install with included accessories, it provides a comfortable pinkish-white glow that’s gentle on eyes while delivering high PPFD for thriving plants.

Specifications

ASIN	B082ZKJZP1
Brand Name	Barrina
Brightness	3100 Lumen
Bulb Base	G23
Color	Pinkish White
Connectivity Protocol	Corded
Control Method	Push Button
Controller Type	Push Button
Customer Reviews	4.6 4.6 out of 5 stars (2,155)
Efficiency	Higher than HPS/MH lights
Finish Types	Powder Coated
Fixture Type	Non Removable
Included Components	Power cords with ON/OFF switch, connecting cords, small connectors, installation clips, tapes, cable ties
Indoor Outdoor Usage	Indoor
Installation Type	Flush Mount
Item Dimensions L x W x H	119.6L x 3.3W x 3.5H centimeters
Item Weight	3.18 kg
Light Color	Pinkish White
Light Fixture Form	Pendant
Light Fixture Installation Location	roofing
Light Output Maximum	3100 Lumens
Light Source	LED
Lighting Method	LED
Manufacturer	Bailina Lighting Electric Appliance Co.,Ltd
Manufacturer Part Number	QL42
Material Type	Aluminum Polycarbonate
Model Name	Barrina LED Grow Light
Model Number	QL42
Mounting Type	Ceiling Mount
Number of Items	6
Number of Light Sources	6
Other Special Features of the Product	Easy Installation, Full Spectrum, High PPFD, Linkable
Power Source	AC
Recommended Uses For Product	for indoor using
Required Assembly	Yes
Room Type	Indoor
Set Name	Pack of 6
Shade Color	White
Shade Material	Aluminum
Shape	T8
Size	4FT
Specific Uses For Product	Indoor use only
Style Name	Pack of 6
Switch Type	Push Button
Theme	Indoor Use, Plant Growing
Unit Count	6 Count
Voltage	270 Volts
Water Resistance Level	Not Water Resistant
Wattage	42 watts

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