Boxlood SD5305020 MR16 5W LED Bulbs, 10 Pack

Boxlood SD5305020 MR16 LED bulbs are supplied as a 10-pack, with a listed 500-lumen output, 6000K cool white colour and 40-degree beam. They are 12V, non-dimmable replacements, so confirm the socket, transformer and fitting dimensions before choosing them.

At a glance

40-degree beam is described as a narrow spotlight beam for directing light at selected areas.
The listing describes the bulbs as 5W LED replacements for 50W halogen bulbs.
Manufacturer instructions specify a 12V supply and recommend an LED transformer. These bulbs are not dimmable.

Price

£21.24Save 15%

Reference price: ~~£24.99~~

Price checked: 14 Nov 2026

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Pros and cons

Pros

The 10-pack can cover several compatible fittings at once.
The listed 500-lumen output and 6000K colour suit buyers seeking a cool-white spotlight.
MR16 shape and GU5.3 base are specified for matching compatible fittings.

Cons

Non-dimmable, so these are unsuitable for circuits that require dimming.

Technical specifications

22 specifications

Identity
Brand	Boxlood
Model	SD5305020
Bulb shape	MR16
Base	GU5.3
Pack quantity	10

Light output
Light source	LED
Rated wattage	5 watts
Maximum light output	500 Lumens
Halogen equivalent	50 Watts
Colour temperature	6000 Kelvin
Listed light colour	Cool White
Beam angle	40 Degrees
Colour rendering index	90
Dimming	NON-DIMMABLE
Listed lifespan	13 Years

Electrical and fit
Voltage	12 Volts
Power configuration	Corded Electric
Control methods listed	Push Button
Listed dimensions	50mm (Height) * 50mm (Diameter)
Usage	Indoor

Other listing details
Energy efficiency label	F
Material	Plastic & Aluminum

What to know before buying

Transformer compatibility matters: the listing says these bulbs require 12V and recommends an LED transformer. It warns that halogen transformers, or a transformer whose output is below the combined bulb load, may cause flicker. Confirm the fixture can accommodate the listed 50mm height and 50mm diameter. The listing gives a CRI of 90 in its specifications but describes it as 80+ in feature text, and its 13-year lifespan is stated without an operating-hours basis. Check these details against the selected listing if they are important.

What’s in the box

Included

10 MR16 LED bulbs

Who is it for?

A good fit for

Buyers replacing MR16 bulbs in compatible 12V GU5.3 fittings who want cool-white, focused light.
Indoor spotlight use in areas where non-dimmable lighting is suitable.

Less suited to

Buyers needing dimmable bulbs.
Fittings without a compatible 12V LED transformer or insufficient transformer capacity.
Buyers seeking warm-white light or a wider beam.

Boxlood SD5305020 MR16 5W LED Bulbs, 10 Pack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 21 ratings

5 stars66%66%
4 stars16%16%
3 stars11%11%
2 stars0%0%
1 star7%7%

The available evidence is limited to aggregate ratings, which lean positive but also include some low ratings. That offers only a broad impression and does not explain how the bulbs perform in particular fittings or transformers. Check the 12V transformer requirements and non-dimmable design against your intended installation.

Frequently asked questions

Are these bulbs dimmable?

No. The listing identifies them as non-dimmable and says not to use them with a dimmer.

What transformer do these MR16 bulbs need?

The listing specifies 12V and recommends an LED transformer. It warns that a halogen transformer or insufficient transformer output may cause flicker.

Will they fit my existing fixture?

Check for an MR16 fitting with a GU5.3 base and room for the stated 50mm height and 50mm diameter. Compatibility with the fixture and transformer is not guaranteed by the listing.

What colour and beam do they produce?

The listing specifies 6000 Kelvin cool white and a 40-degree beam angle.