LED lamps for general lighting

Chris French · 2014-10-08T12:38:48+00:00

We have a few light fittings with LED GU10's and a one with an R40 spotlight bulb in, and the are fine (though the R40 doesn't really work so well in the fitting it is in as it is a frosted glass shade, but there isn't any back spread of light from it. We have two light fittings in a hallway, each currently with 3X40W golfball bulbs in (I had the bulbs when I put them up last Autumn, and never got round to replacing them, but a couple are now blown). My intention was to replace them with some CFL's, but wondering about LED's instead - they spend a lot of time on as are between the two rooms we spend a lot of time in, and in winter can be on quite a lot even in the daytime as not great natural light in there. The fittings have upward facing frosted glass shades, with the bae of the shade roughtly at the base of the lamp fitting, so the bulbs need to put light out all round to avoid shadow on the shades, wondering how good the general spread of light is from LED lights now, they all still seem to have a plastic base that extends up a fair way into where the glass of a would tungsten bulb would be.

Oct 08, 2014 21 Replies

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DerbyBorn 11 years ago

Grimly Curmudgeon wrote in news: snipped-for-privacy@4ax.com:

Blimey that looks good. I only looked because I thought they had made a daft error in using the word "filament" - but it suits the application.

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Johny B Good 11 years ago

The big problem with that design is in regard of cooling the 'LED Filaments' which can only be via convective cooling. The appearance suggest a gas filling of some sort.

Since the effectiveness of convective cooling is largely dependent on the conductivity of the gas used, I'd expect the use of helium or hydrogen as the gas filling (both are around an order of magnitude better than air).

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