Says full spectrum but then does 400-740nm mean no UV light?

This should be the full spectrum of visible light (without UV light). I have not tested it to know how well it meets this criteria, but the 400-740nm is about right. UV is less than 400nm.

Could i use this grow light bulb in my bedside table lamp? I have a sansevieria snake plant very close to this lamp that might benefit from a growligh

I used these in my dining room light fixture. They are the size of a regular light bulb. As far as wattage and safety, I don't know.

How much would it cost to burn 3 of these bulbs for eight hours a day?

0.216 x (your kilowatt/hour rate) check your bill to see what you pay. probably around 3-4 cents for eight hours

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2 Pack 400 Watt Vegetable Metal Halide MH Glow Bulb Lamp - Enhanced Blue and Purple Spectrum CCT4200K36000 Lumens

2 Pack 400 Watt Vegetable Metal Halide MH Glow Bulb Lamp - Enhanced Blue and Purple Spectrum CCT4200K36000 Lumens

Product ID: 726486979

Details

Brand
Wiyifada
Bulb Base
E26
Light Type
Halogen
Special Feature
Dimmable
Wattage
9 W

💡400W power for intense growth

🔵Enhanced blue & purple spectrum

🎛️Dimmable for perfect light control

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S$51

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Description

🌱 Light up your green thumb with power and precision!

HIGH LUMEN OUTPUT - A blazing 36,000 lumens flood your indoor garden with life-giving energy.
RELIABLE E 26 BASE - Standard E26 base ensures easy installation and compatibility with most fixtures.
CUSTOMIZABLE BRIGHTNESS - Dimmable feature lets you fine-tune light intensity to match every growth stage and mood.
POWER PACKED PERFORMANCE - 400 watts deliver robust illumination to supercharge your plants’ growth cycle.
SPECTRUM THAT SPEAKS GROWTH - Optimized blue and purple light spectrum (CCT 4200K) tailored for vibrant, healthy vegetation.

This 2-pack of 400W Metal Halide MH Glow Bulb Lamps by Wiyifada offers a high-intensity, dimmable lighting solution with an enhanced blue and purple spectrum (CCT 4200K) and 36,000 lumens output, designed to optimize indoor plant growth. Featuring a standard E26 base and robust 400W power, these bulbs bring professional-grade horticultural lighting to your home garden setup.

Specifications

ASIN	B085ZVM2R7
Additional Features	Dimmable
Brand Name	Wiyifada
Bulb Base	E26
Bulb Diameter	2.36 インチ
Color	Full Spectrum
Color Rendering Index	90
Color Temperature	3000 Kelvin
Customer Reviews	4.6 4.6 out of 5 stars (5,655)
Incandescent Equivalent Wattage	100.01 Watts
Indoor Outdoor Usage	Indoor
Is Electric	Yes
Light Color	Blue, Purple
Light Source Wattage	9 Watts
Light Type	Halogen
Manufacturer	Wiyifada
Manufacturer Part Number	194
Material Type	Plastic
Model Number	194
Package Quantity	1
Power Consumption	9 Watts
Shape	Arbitrary(A)
UPC	763032083877
Unit Count	2.0 Count
Voltage	120 Volts
Wattage	9 W

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