2 of 2 people found the following review helpful
Excellent replacement for 10 or 20 watt MR11 halogen reflector lamp,
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This review is from: MR11 Philips Master LED 12V 3w Cool White GU4 2 pin 24 Degree Beam Angle Low energy saving light bulbs lamps 12 volt "A" Energy Rated (Electronics)
The 'Lumo Microspot' adjustable lights in my caravan came with 12 volt 10 watt MR11 tungsten halogen 10 degree 'spot' reflector lamps but they drained the leisure battery too quickly. I searched the internet for hours only to find that 99% of the LED lights that would fit (32mm dia glass, approx 35mm long including the GU4 or GZ4 base pins (search GU4 in Wikipedia for info on bi-pin bases)) were floodlights that would shine in my face all over the place rather than just where the light was wanted (eg. for reading or lighting a table).
These 3 watt Phillips Master LED's do deliver the claimed 24 degree directional light, they do scatter a little light outside the main beam (as do halogen reflector lamps) but not enough to cause glare to the eyes.
As to colour temperature the 'cool white' light (4000 Kelvin) is much whiter than the typical tungsten halogen light; it is good for reading and delivers warmer mood light if reflected off warmer 'off white' surfaces. The very same lamps were made in warmer white light (2700 Kelvin) that some people might prefer but I could not find any source of those that was not at least twice the price of the 'cool white' available from this source.
As to brightness compared to MR11 tungsten halogen lamps; another reviewer said that the Master 3 watt were not quite as bright as a 20 watt tungsten but he was happy with them. I can confirm that the Master 3 watt 'cool white' are considerably brighter than 10 watt tungsten and I guess the Master 'warm white' (if available) must be at least noticeably brighter.
Having tried (without success) to find out why Phillips appear to have discontinued them I bought two and found them to be excellent replacements for my tungsten reflector spots, without any shortcomings. I only need two and they are extremely unlikely to ever fail; nevertheless, faced with the possibility of them not being available again, I ordered two more spares!!!
I am fed up with researching these lamps and will never know why Phillips appear to have discontinued them unless someone else does the donkey work and reports it! They seem unique in delivering a 24 degree directional beam rather than a flood.
Phillips do make a similar 4 watt MR11 (that would be too bright for my caravan application) that, unbelievably, I understood has a cooling fan inside - the noise of which would be dreadful (possibly not initially but certainly after a while) in any domestic or caravan setting but OK for shop window or similar displays. I understand the cooler the LED the more lumens per watt and longer life I guess.