Hi all,

In order to save the world, I bought 5 of these Megaman GU10 CFL dimmable bulbs from eBay to replace those 50W halogen bulbs in the kitchen diner. Plus of course in summer these halogen bulbs boil the top of my head!

The Megaman bulbs are 230V, 11W each, and claim to be dimmable from ANY dimmer in a NORMAL manner - unlike their previous DoRs range where you had to flick the switch off and on to dim...

I have six GU10 bulbs in the kitchen, and I plan to replace five of them, leaving a bit of load for the dimmer.

The dimmer I have is an X10^2 wall switch from Kevin Lo, which works very well with the halogen bulbs and is very reliable compared to Marmitek's products. The min load is 40W for the 2-wire version as said on the spec sheet. I think the min load is 20W for the 3-wire version.

Okay first thing, to any one planning to buy one of these, you MUST leave the Megaman bulbs on full brightness for at least a minute the first time you use it!! So resist the urge to try to dim it... It looks like the circuit "learns" what the maximum brightness should be.

Upon fitting one of these, first impression is that the colour temperature is very nice (I have the warm white version). It is less yellowy than a halogen bulb, but still provides a warm glow - very good for people with SAD. And yes it is more of a glow than a "spot" like with a halogen bulb. And it is slightly dimmer than a 50W halogen bulb, so I guess it is more like a 35W halogen bulb in terms of light output. Bulb warm-up time is very quick.

So after that, I put the other four on, and... nothing would switch on! :O Not even the remaining halogen bulb. Having a bit of messing about, I found that any more than 3 Megamans in the circuit, nothing would switch on. I guess it is to do with the inductive nature of the Megaman bulbs rather than not having enough load for the dimmer. So now I am using three halogens and three Megamans.

And because of the way these Megamans work, "soft-on" feature from the dimmer no longer works. "Soft-off" is still okay, but it is not very "soft" with Megamans - it dims from 100% to 20% then suddenly cuts off.

So all in all, it kind of works, but not brilliantly. I will probably buy a couple more for the living room to avoid skin burn on the top of my head, but I will only commit to fully replacing all my halogens once more advanced technologies are available. That and ideally I want LED not CFL!

Price is quite expensive at 14 each. But buying from eBay means it is 8 each inc postage, so not TOO bad for a techno/enviro-sucker.

For the physical fitment, it is slightly longer (about 1.5cm) than a normal GU10 bulb. My light fitting is open-back so it is not a problem for me, except I can't adjust the angle of the holder anymore.

By the way, Rako has come up with a new module to specifically work with these bulbs, and I very likely will try it in the near future.
http://www.onidserv.com/rako/product/565

Thanks.