8mm Forum: Heurtier projector new lamp

This is topic Heurtier projector new lamp in forum 9.5mm Forum at 8mm Forum.

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Posted by Luigi Castellitto (Member # 3759) on November 25, 2017, 05:47 PM:

I would like to change my Heurtier Tri-Film 53 lamp with a brighter one, for my 9,5mm films.
The manual says that the projector can accommodate (on 110 volt) 250, 300 and 500 watts, i would like to take one of 500 watts, now i have a 300w.
It does not specify the model, but it should be P28.
Only, on the web I found this others feature:

What's the difference between P28 and P28s? "S" is an addendum that means "standard"?

I found signs like A1/6 and A1/7 (always on P28 models). It seems that A1/6 is always 300 watts, while A1/7 is always 500 watts. Is it therefore an acronym that refers to the watts?

Thank you. [Smile]

Posted by Maurice Leakey (Member # 916) on November 26, 2017, 02:33 AM:

Projection lamps in the UK are pre-fixed with A1/
The number which follows refers to a specific lamp and watts. But not the voltage.
The 500watt with the prefocus base is, as you say, A1/7 (now quite rare), but make sure you buy the correct voltage.

Posted by Dominique De Bast (Member # 3798) on November 26, 2017, 04:06 AM:

Interesting questions, Luigi. I have no idea what the "s" means and I wonder if there is a difference between p28 and p28s. The "28" in the reference stands for 28 mm, the base circonference. That's probably why it is not used in the Uk or the Us since 28 mm is a metric reference. What does the P means ? P for projection ?

Posted by Luigi Castellitto (Member # 3759) on November 26, 2017, 11:09 AM:

Thank you, boys.
Yes, my Heurtier is 110v, lamp absolutely at 110v, like the old French voltage. Me, in Italy, use it with the converter to bring it to 230v.
Dom, I also think that "P" is for a "P"rojector, in fact all the boxes I have seen of this bulbs have write "lamp for projector".
On "s" I still doubt, but it could be "standard" as I said, and it is a plus information, not a difference between P28 and P28s.

Posted by Dominique De Bast (Member # 3798) on November 30, 2017, 11:40 PM:

Is there any hope to see one day a compatible p 28 led bulb for projectors ? It seems that some models already exist but not bright enough and probably not with the correct design to concentrate the light at a projector gate level. But who knows what can come further on the market ?

https://www.easy-lightbulbs.com/light-bulbs/marine-navigation-bulbs/marine-navigation-bulbs/p28s/navl115c/

Posted by Luigi Castellitto (Member # 3759) on December 01, 2017, 07:09 PM:

I had not thought about this solution for a big bulb like this. I have to see if in chinese megastores there is something like that, but you're right, it's very difficult, P28 it's a very rare base.
However, I must say that on the Patescope Ace was not satisfied by the LED solution, neither hot or cold light; in that case it was lower than the halogen solution.

Ah, after searches and questions, I can say at 90% P28 and P28s are the same thing

Posted by Luigi Castellitto (Member # 3759) on December 12, 2017, 02:18 PM:

Does anyone know if I can also use 100v or 115v or 120v or 125v bulbs on my projector (which normally requires a 110v bulb)?
Thank you!

Posted by Dominique De Bast (Member # 3798) on December 12, 2017, 04:57 PM:

You can even use 120, 125 or 130 volts bulbs without problem in a 110 v projector but of course the light will be less bright than with a 110 volts lamp. In theory, if you use a 100 volts you should not have other problem than a shorter life of the lamp (that would be brighter than normal) but I would personnaly not try.

Posted by Luigi Castellitto (Member # 3759) on December 14, 2017, 12:24 PM:

Thank you, Dom, very precise. So I'd better take 110v.

In the meantime, I say two things:

1) The P28 bulb type are in DIFFERENT shape of blub. A friend sent me a p28 500w 110v (on the label is write this), but unfortunately the connect is right, but it's a model more "fat". Precisely this:

My projector, instead, requires the classic thinner and long model, like this:
https://www.ebay.it/itm/202114918289?_trksid=p2380057.m570.l5999& _trkparms=gh1g%3DI202114918289.N36.S1.R1.TR6

2) About that announcement on ebay above. I would like to buy that light bulb, it's at a very convenient price compared to others ads, but the seller speaks of "carbon deposit".
I think it means that these deposits are at the base of blub, not on glass, and should not affect brightness or working.
Unfortunately, the seller does not respond to emails.
Can I buy it safely, do you think?

Posted by David Guest (Member # 2791) on December 14, 2017, 01:10 PM:

i have 100s of rare lamps for all kinds of projector tell me the model number eg a1 etc and voltage and I am sure I will have it in stock also got loads of 9,5 sound films features and shorts
all lamps are new but old stock

Posted by Luigi Castellitto (Member # 3759) on December 14, 2017, 01:45 PM:

David, I need a 500 watt 110 volt bulb. I prefer 110v and not 100v.
Not at 50 euros like on eBay, it's too much expansive! [Frown]

The model of lamp is P28, but I know that in Uk the 500w it is also called A1/7.
See the eBay link I posted to see the shape.
Thank you. [Smile]

Posted by David Guest (Member # 2791) on December 14, 2017, 03:21 PM:

I will check to see what I have and if I have any they are £5.00 each plus postage at cost

Posted by Luigi Castellitto (Member # 3759) on December 14, 2017, 04:13 PM:

David, maybe you find it, I buy it now!

Posted by David Guest (Member # 2791) on December 28, 2017, 05:53 PM:

I will take a look for you

Posted by Luigi Castellitto (Member # 3759) on December 28, 2017, 06:14 PM:

Thank you! When you can, of course!

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