Osram Decostar 51 Energy Saver Halogen Dichroic Reflector Lamps GU5,3

osram_decostar_51_es_35w_50w_halogen_energy_saver_47865The Osram IRC range of lamps were released a few years ago but have been both hard to get in Australia and expensive. I’ve been paying around AUD$13 for each lamp and having to buy online as other than the electrical wholesalers they’re not stocked by retailers who instead tend to stock the no name 20-30% energy saving lamps for around AUD$10-15. At these prices it’s hard to justify replacing them all when you work out potential energy savings.

Recently I found some Osram Energy Savers at Bunnings which look identical to the current ones I’ve been purchasing except the part number is slightly different and they come in retail packaging. Bunnings only stock the one type that I could see which is the 50w equivalent with 35w power usage. The surprise for me was the pricing AUD$5.49!

The details for the one that I’ve been purchasing is

Decostar 51 ES 35W 12V 48865 ES WFL GU5,3 36° (5000 hours life)

The new one in blister pack at Bunnings is

Decostar 51 ES 35W 12V 47865 ES EFL GU5,3 36° (4000 hours life)

Other than the packaging the only omission I can see is there is no mention of IRC technology on the blister pack, but there isn’t as much information on IRC when you look at Osram website so it could be possible they’re removing mention of that to make this more marketable (ie to people who only want to save power and don’t care about IRC technology).

Osram don’t mention the 47865 lamp on their website either. The specs for it should be the same or similar to 48865.

35W, 12V, 36 degrees, 2200 lumens.

Perhaps the 47865 doesn’t use IRC technology and as such has a shorter life span? When I get time I’ll do a test to see if I can see any difference in the output or temperatures. Photos of both packages are listed, note that the blister pack is of the 25w/35w but other than that it’s identical to the 35w/50w.


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  1. I’ve been using these too. Now that winter is here again (in Australia) I’m more sensitive to interior light and found they have dimmed to about half original brightness after 2.5 years in a house used at most 4 hours every day.

    So effective life is probably more like 3000 hours depending on how dim you want to let them get.

    Only one of our 10 bulbs actually failed in 2.5 years so reliability is good.

    Light output was measured with a lux meter on the kitchen bench directly below the light (about 1.4 m below). After replacing with a new bulb, light output doubles from around 400 to 800 lux (I’m using the 35w/50w bulbs in the box).

    Now the bulbs are all replaced it looks like we have a bright new kitchen again and I don’t have to reach for my glasses to read a recipe.

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