Can I use this in a ceiling light or does it need a special lamp?

You can if you have the right fitting for it ,it’s a wide screw in one

How much it cost for each bulb say 12hr per day in uk approximately please?

Based on the cost of electricity being 27p per Kilowatt Hr the cost would be about 12p. I have used the Sansi 36 Watt bulb over a propagator in my cellar timed to be on and off at 12 hour periods so I know the running costs.

What type of lamp holder are you using with this bulb? i have not managed to find a single one that would safely accommodate over a 13-watt lightbulb.

I bought a Bakelite Pendant light fixture that has an E27 Edison Screw (the bulb Sansi bulb screws in). I messaged the guy who sells them and he said it would take the bulb fine as it was designed to be used with a 100 watt incandescent bulb which gets a lot hotter. It worked well, I had the Sansi light on for 8-10 hrs a day for months and it was fine, the Sansi light doesn't get that hot. I got it from duggi Design on Etsy. Plug in Pendant Light - Smooth Bakelite Version - Fabric Cable, Lamp Holder and Plug - E27 Edison Screw - Vintage Retro Cord - duggi Design

Product Dimensions	7.2 x 7.2 x 10.3 cm; 150 g
Part number	01-03-003-021500
Material type	Aluminium, Ceramic, Plastic, Polycarbonate (PC)
Power source type	Corded Electric
Manufacturer	SANSI
Item model number	C23ZW004-V0015A27
ASIN	B081DZ8Z31

SANSI 15W LED Plant Grow Light

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