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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4FT T8 Plant Grow Light, 42W Full Spectrum LED Growing Lamp, 6 Pack

Product ID: 179519096

Details

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

🌈Full spectrum light for optimal plant absorption

💡252W power, replaces 1400W traditional lights

🔗Link up to 6 units for scalable indoor gardens

$340.77

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Description

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

POWERFUL EFFICIENCY - Consumes only 252W while delivering brightness equivalent to 1400W, saving energy without compromising growth.
EYE COMFORT SAFETY - Pinkish white light reduces eye strain while the upgraded design prevents accidental electrical mishaps.
MODULAR EXPANDABLE - Easily link up to 6 grow lights in series to customize your indoor garden setup with seamless connectivity.
USER FRIENDLY INSTALLATION - Includes tape, clips, and cable ties for quick, hassle-free setup—get growing in minutes without professional help.
SCIENTIFICALLY TUNED SPECTRUM - Full spectrum LEDs mimic natural sunlight, maximizing photosynthesis and boosting plant health indoors.

The Barrina 4FT T8 Plant Grow Light 6-pack offers a full spectrum LED solution delivering 3100 lumens at just 252W power consumption, effectively replacing traditional 1400W grow lights. Designed with a V-shaped reflector and aluminum housing for enhanced light efficiency and heat dissipation, it supports linking up to six units for scalable indoor gardening. Easy to install with included accessories and featuring eye-friendly pinkish white light, this set is ideal for professional and hobbyist indoor growers seeking energy-efficient, high-performance plant lighting.

Specifications

ASIN	B082ZKJZP1
Best Sellers Rank	#9,837 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #13 in Plant Growing Light Fixtures
Brand Name	Barrina
Brightness	3100 Lumen
Bulb Base	G23
Color	Pinkish White
Connectivity Protocol	Wired
Control Method	Push Button
Controller Type	Push Button
Customer Reviews	4.6 4.6 out of 5 stars (13,377)
Finish Types	Powder Coated
Fixture Type	Non Removable
Included Components	Light kit inlcuded
Indoor Outdoor Usage	Indoor
Installation Type	Flush Mount
Item Dimensions L x W x H	47.1"L x 1.3"W x 1.38"H
Item Weight	7 Pounds
Light Color	Pinkish White
Light Fixture Form	Pendant
Light Output Maximum	3100 Lumens
Lighting Method	LED
Manufacturer	Bailina Lighting Electric Appliance Co.,Ltd
Manufacturer Part Number	QL42
Manufacturer Warranty Description	2 years.
Material Type	Aluminum, Polycarbonate
Model Name	Barrina LED Grow Light
Model Number	QL42
Mounting Type	Ceiling / Hanging
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	6-pack
Shade Color	White
Shade Material	Aluminum
Shape	T8
Size	4ft-6 Packs
Specific Uses For Product	Indoor use only
Style Name	Pack of 6
Switch Type	Push Button
Theme	Indoor Use, Plant Growing
Unit Count	6.0 Count
Voltage	270 Volts
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wattage	42 watts

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