where to buy these bulbs ?

[dustcritter]

Hey guys so i was speaking to a member on here who said i should get another bulb for my microscope and i thought "hey he is right" but i finally checked my bulb out tonight and it seems its eaither the orgional bulb which is 18 years old or a replacment. but i have tried looking for a 20w E27 bulb with the code 0698 but i can't find them anywhere and im not sure if i can go down a diffrent route like changing for LED lights i hope someone can give me some info

[75RR]

Catalog No. is 8-B150
See pdf:
http://www.olympusamerica.com/seg_secti ... atalog.pdf

Hope you can find it a bit cheaper than this.

http://www.bulbtronics.com/%28S%28ffuso ... eSupport=1

[dustcritter]

thank you for that wow that was quick , i was wondering could i not convert it and put a g4 base and use hologen lamps ? or leds or would that simply not work

[75RR]

I would keep it simple. If you can get the original bulbs then keep to the manufacturers design.

[dustcritter]

alright ill do that i don't think the bulb is that expensive

[gekko]

I think the bulb that 75RR referred to from the Olympus bulbs list is for use on 120V supplies. I think the UK is on 240V so make sure that the bulb you buy matches your supply voltage. Good luck!
Also, prices for bulbs like that can vary quite a bit, at least here in the US, so you may want to check around.

[dustcritter]

i found this its a fair bit cheaper

https://www.interlight.biz/light-bulb/8-B150

oh yea gekko your right im curious what problems would i have with a 120v as apposed as the 240v ?

[gekko]

i found this its a fair bit cheaper

https://www.interlight.biz/light-bulb/8-B150

Don't you need one rated at 240 volts?

[Crater Eddie]

I would keep it simple. If you can get the original bulbs then keep to the manufacturers design.

Excellent advice.
CE

[dustcritter]

just checked my current bulb yea its 240v, not sure where i can pick these up

[75RR]

You might ask the previous owner

[dustcritter]

ill send him a text now i was wondering can't i use a STEP DOWN VOLTAGE CONVERTER TRANSFORMER 240V TO 120V for the microscope ?

[apochronaut]

Bulbs go by an ANSI # ( American National Standards Institute). A similar bulb is available in Canada under the ANSI # 20G11-220. Probably the same # in the U.K. may be used but suppliers often convert over to their own part # which confuses things.
The specs. on 20G11-220v are 35mmx 55mm( including the base), 220v,20watt,E26( same as E27) base, 1000 hours .

[75RR]

Bulbs go by an ANSI # ( American National Standards Institute). A similar bulb is available in Canada under the ANSI # 20G11-220. Probably the same # in the U.K. may be used but suppliers often convert over to their own part # which confuses things.
The specs. on 20G11-220v are 35mmx 55mm( including the base), 220v,20watt,E26( same as E27) base, 1000 hours .

Do you have a link for that ? Can't find one.

[billbillt]

Yes, you can use a step down transformer...

BillT

[billbillt]

ill send him a text now i was wondering can't i use a STEP DOWN VOLTAGE CONVERTER TRANSFORMER 240V TO 120V for the microscope ?

Yes, you can use a step down transformer..

BillT

[gekko]

Assuming that the lamp is not supplied through a dimming circuit, I think one of the following should be an excellent solution:
http://www.amazon.co.uk/GOLF-BALL-BULB- ... +golf+ball
This will give more light, but is a bit longer (78 mm vs. 70 mm for the 1 W bulb), so it may or may not fit:
http://www.amazon.co.uk/Globe-Edison-Sc ... 7+bulb+led
Both of those will run much cooler than the original incandescent bulb, and will last much longer.

[gekko]

One method I use to dim the lamp: I use two (linear) polarizing filters and place them (in your case) on the lamp housing, then I can dim the light by rotating one relative to the other. If you need to do this, you can get inexpensive ones on ebay.
You can search ebay by using the following search terms: polarizing filter -cpl -circular
(you do not want circular polarizers, often designated by CPL).

[Edit:] I think you may only need the polarizers for dimming if the you can use the 4 W bulb. The 1 W bulb may already be on the dim side (but perhaps someone reading this will let us know).

[apochronaut]

Bulbs go by an ANSI # ( American National Standards Institute). A similar bulb is available in Canada under the ANSI # 20G11-220. Probably the same # in the U.K. may be used but suppliers often convert over to their own part # which confuses things.
The specs. on 20G11-220v are 35mmx 55mm( including the base), 220v,20watt,E26( same as E27) base, 1000 hours .

Do you have a link for that ? Can't find one.

I see that I neglected to add the v at the end of the ANSI # I supplied , in the first line. Perhaps that made a difference.
I sometimes use Microlites Scientific for bulbs. They are very good. I'm sure if it is available at all and for a scientific application he can source it. Egyptian guy founded it, about 30 years ago, I would guess..
He is super professional, and catalogues everything by the ANSI # as well as his own part #. Has a very comprehensive listing, which allows for numerous ways of figuring out which bulb. I searched for 220v and the base and bulb shape. His catalogue makes it all very logical and easy.

They do supply higher end institutions and their customer base is pretty picky, so generally these are seldom budget Chinese bulbs.
Here's the 220v page.
http://www.microlites.com/eng/catalog.p ... turer=220V

[lorez]

This discussion is a little hard for me to follow (i'm a bit dense) so I'm not sure what direction my suggestion should go but there are a couple of things that come to mind first Apos ANSI code is the place to start then when you locate a vendor they will be able to find what you need easily second the illuminator on your scope is the lowest style available but it does at least demand that the specifics of the bulb be adhered to so if you are using a substitute pay close attention to the dimensions also this illuminator is very poorly focused and barely provides enough light to do the basics so dimming the 20W bulb may not add, much, and third if you decide to use an LED there is some room for some original thinking and the end result from a 3W LED with a dimmer will put you where the current models are with regards to light intensity

[gekko]

apochronaut, thanks for the very useful link. If I did it right, the correct bulb seems to be (Microlites part no.) 120-020-53F. However, if the 4W LED I linked to above will fit, I think it should be a very practical solution in that it should give more light and less heat the the incandescent bulb.

lorez, the two LED bulbs are direct replacements (the 4 W one may be physically too large, I don't know). I suspect that the 1 W LED may not give enough light, but considering the price, it may be worth trying if the 4 W LED bulb doesn't fit. Since Amazon give the exact dimensions, dustcritter can easily measure the space to determine of it will fit or not. I am making the assumption that at the moment dustcritter is simply interested in having a spare bulb as a direct replacement for the existing incandescent bulb should it fail. But I get your point about having a dimmable LED system- perhaps he will decide to undertake such a project at some point.

In any case, I am responsible for creating all this trouble for everyone when I suggested innocently that he might want to keep a spare bulb on hand .

[lorez]

gekko, I did check the dimensions of the bulbs and the 4W was too big. The important aspect is the alignment of the filament, or light producing device, with the lens in the illuminator. A too large bulb may fit the space available, but would not produce the best results. The 3W LED I am thinking about is the simple 'star' disc style that can be mounted on an OEM device. I use these frequently with a power supply and dimmer and the results are very good. My most recent conversion was the 10W halogen of the Zeiss Standard 16.

Who'da guessed that a spare bulb could take such a detour.

lorez

[apochronaut]

apochronaut, thanks for the very useful link. If I did it right, the correct bulb seems to be (Microlites part no.) 120-020-53F. However, if the 4W LED I linked to above will fit, I think it should be a very practical solution in that it should give more light and less heat the the incandescent bulb.

lorez, the two LED bulbs are direct replacements (the 4 W one may be physically too large, I don't know). I suspect that the 1 W LED may not give enough light, but considering the price, it may be worth trying if the 4 W LED bulb doesn't fit. Since Amazon give the exact dimensions, dustcritter can easily measure the space to determine of it will fit or not. I am making the assumption that at the moment dustcritter is simply interested in having a spare bulb as a direct replacement for the existing incandescent bulb should it fail. But I get your point about having a dimmable LED system- perhaps he will decide to undertake such a project at some point.

In any case, I am responsible for creating all this trouble for everyone when I suggested innocently that he might want to keep a spare bulb on hand .

He is 220V!

[lorez]

He is 220V!

What is the standard line voltage in Canada ?

lorez

[apochronaut]

Microlites sells all over the world. Dustcritter needed a bulb for England. They are 220. Gekko , picked out a # from the MIcrolites lists which had a 110 prefix. It is clearly a bulb with a 110 volt requirement. I had already pointed out the correct 220 volt #. Canada is the same as the U.S. , if that matters .
I'll say this discussion is a little hard to follow.

[lorez]

if that matters

Now that you mention that dustcritter is in the UK.... not so much.

lorez

[gekko]

He is 220V!

My mistake-- sorry!