Can you use dimmable low voltage halogen bulb MR16 12V 20 watt without dimmable switch ie standard switch

Of course you can use it without a dimmer switch! I suspect the emphasis on it being dimmable is because many of the newer energy saving technologies do not work with traditional dimmer switches designed for older incandescent bulbs. However, it's worth noting that if you do fit a dimmer such that you "turn the volume up" whenever you use the light, the soft start may extend the life of the bulb by a generous margin as this will reduce the thermal shock caused by simple on/off switching.

What is the diameter of the bulb face please?

Halogen spot GU5.3 (MR16) 20W 36 ° 205lm 12V dimmable. Size: ø50x46mm. So the Diameter is 50mm. Dont forget that these run off 12V DC via a step-down transformer. Standard UK mains will blow them immediately.

Have downlighters under loft insulation and warned about heat vs dichroic. Do these generate upward heat please?

I have mine under loft insulation and when I put the system in I had the same thought. I ended up cutting a small hole in the insulation to let any heat escape. I have had them for years since without issue.

I want an open bulb i.e. no glass cover. Does this bulb have a glass cover? If it does can you buy one without a glass cover.

Yes it has a cover. I have not seen any with no cover. It would be dangerous I would think.

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5-Pack Halogen 12V MR16 20W GU5.3 36D 4000Hrs Dimmable Halogen Dichroic

Product ID: 152926521

Details

Brand
PHILIPS
Bulb shape size
MR16
Light type
Halogen
Special feature
Dimmable
Wattage
20 watts

⏳4000 Hours lifespan

💡205 Lumens brightness

🎛️0-100% dimmable control

AR$99909

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Description

✨ Illuminate smarter, live brighter with Philips precision 💡

SEAMLESS DIMMING - Smooth 0-100% dimmable feature lets you set the perfect mood anytime.
LONG LASTING GLOW - Up to 4000 hours of reliable illumination—less hassle, more ambiance.
READY WHEN YOU ARE - 5-pack convenience ensures you’re never left in the dark—always prepared, always stylish.
SPOTLIGHT YOUR SPACE - Perfect 36° beam angle for focused accent lighting that elevates your décor.
COOL TOUCH WARM LIGHT - Dichroic coating reduces heat on objects while delivering a balanced warm white glow.

This 5-pack of Philips 12V MR16 halogen bulbs offers 205 lumens of warm white light with a precise 36° beam angle, ideal for decorative accent lighting. Featuring a durable 4000-hour lifespan and smooth 0-100% dimmable control, these bulbs include a dichroic coating to minimize heat on illuminated objects. Designed with a GU5.3 base for easy installation, this set ensures you’re always ready with reliable, stylish lighting solutions.

Specifications

ASIN	B07WRYXQ85
Accepted Voltage Frequency	100 to 240 Volts and 50 Hertz to 60 Hertz
Average Life Span	4000 Hours
Beam Angle	36 Degrees
Best Sellers Rank	38,011 in Lighting ( See Top 100 in Lighting ) 711 in Halogen Bulbs
Brand Name	PHILIPS
Bulb Base	GU5.3
Bulb Shape Size	MR16
Color Rendering Index (CRI)	100.00
Color Temperature	3000 Kelvin
Colour	White
Connectivity Technology	Infrared
Control Method	App
Controller Type	Push Button
Customer Reviews	4.5 4.5 out of 5 stars (974)
EU Energy Efficiency Label	10.25 lm/W
Incandescent Equivalent	20 Watts
Indoor Outdoor Usage	Indoor
Item Shape	MR16
Item Weight	0.14 Kilograms
Light Color	Warm White
Light Output Maximum	205 Lumens
Light Source Wattage	50 Watts
Light Type	Halogen
Manufacturer	PHILIPS
Manufacturer Part Number	M269_SML
Material Type	Glass
Model Number	M269_SML
Number of Items	1
Package Quantity	1
Power Consumption	20 Watts
Power Source	Electric
Special Features	Dimmable
Specific Uses	Decoration
Style Name	Modern
Type of Bulb	Halogen
Unit Count	5 count
Voltage	12 Volts
Wattage	20 watts
White Brightness	205 Lumens

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