70W HPS bulb on 230V mains with No Ballast - Just trips the MCB :(

ericmark · 5 Jun 2016

Does it matter? Over the years I have cleaned out the different vans or cars and the garage has gained MCB's, bulbs, and other junk which should have really been binned, but I thought it may come in use full. Some with books full Lucas Workshop manual but I have not worked on vehicle electrics for 25 years. Some I have given away to good homes, but only people working on vintage cars would want most of the car books, and electrics are worse who wants a 15th edition on site guide? Normally the week after it goes in the bin some one asks if I have one.

eveares · 5 Jun 2016

Spark123 said:
Don't be surprised if the ignitor has welded it's contacts together.

It indeed has, bulb has now gone to a dead short.

ban-all-sheds · 6 Jun 2016

Iggifer said:
You'd need to get to photonicinduction levels of silliness to blow them up

Colin Furze could be a contender, maybe?

ban-all-sheds · 6 Jun 2016

eveares said:
So today I did a little experiment and thought I would see what would happen...

"So" is a linking conjunction.

If it would have made no sense, and been obviously wrong for you to have written

And today I did a little experiment and thought I would see what would happen...

or

But today I did a little experiment and thought I would see what would happen...

Then it was equally senseless and wrong to have started with the word "So".

Iggifer · 6 Jun 2016

ban-all-sheds said:
Some grammar corrections

Don't even get me started. I have to bite my tongue (fingers?) every time. What seems to be the only pronoun he uses.

EFLImpudence · 6 Jun 2016

He must have been born during the great that and which shortage.

Spark123 · 6 Jun 2016

eveares said:
Spark123 said:

Don't be surprised if the ignitor has welded it's contacts together.

Click to expand...

It indeed has, bulb has now gone to a dead short.

Same thing happens when you put some SON I lamps in fittings with external ignitors.

Iggifer · 6 Jun 2016

EFLImpudence said:
He must have been born during the great that and which shortage.

What one was that?

eveares · 6 Jun 2016

Iggifer said:
Don't even get me started. I have to bite my tongue (fingers?) every time. What seems to be the only pronoun he uses.

Are you referencing me?

This is not a English literature forum is it....

ban-all-sheds · 6 Jun 2016

No, it isn't.

It isn't even an English language one.

But some excrescences are so egregious that they earn excoriation.

eveares · 6 Jun 2016

Just a few photos of the 70W HPS bulb with the dead internal ignitor. Does anyone know what the little square tab thing is as pointed out by the red arrow in the 2nd photo. I also take it the bit of glass as shown by the blue arrow in the 3rd photo is just left over from the manufacturing process and has no role in the bulbs operation.

View 1:
[GALLERY=media, 97848]70w SON-E I HPS Bulb - View 1 by eveares posted 6 Jun 2016 at 8:04 PM[/GALLERY]

View 2:
[GALLERY=media, 97849]70w SON-E I HPS Bulb - View 2 by eveares posted 6 Jun 2016 at 8:04 PM[/GALLERY]

View 3:
[GALLERY=media, 97850]70w SON-E I HPS Bulb - View 3 by eveares posted 6 Jun 2016 at 8:04 PM[/GALLERY]

Echo the husky · 6 Jun 2016

The square part is the 'getter' and when it is activated during manufacture it helps absorb any gasses remaing in the envelope after evacuation. See here.