RMweb Gold chuffinghell Posted January 16, 2020 Author RMweb Gold Share Posted January 16, 2020 2 minutes ago, Andrew P said: Damage will always occur when trying to un stick anything you need to reserve, but the insertion of a good corner Gusset never hurt anybody. If using a Bulb I tend to make up a form of Gantry using Rail, and that keeps the Bulb away from Plastic etc as a lot of heat will be caused. You can also get Yellow LED's for a more realistic Steam era glow. I did too good a job of attaching the roof but other than requiring a re-paint the roof sections have survived the demolition I had to use gussets to pull it back square but they have added strength I would only be powering bulbs at about 3v so hopefully they wouldn't generate as much heat, I had thought of housing them in an aluminium tube thinking the aluminium would dissipate the heat? I do have some yellow LEDs but they just look too yellow for my liking, I've ordered some 'diffused soft white' LEDs to see if they are any better 2 Link to post Share on other sites More sharing options...
AlfaZagato Posted January 16, 2020 Share Posted January 16, 2020 I've always understood gas lamps to burn yellow. It might pay, though to look into what color the gas actually burns. I think color might have something to do with the filaments, too. LEDs are odd to me. I think, as they do not generate heat, you may be able to play around with translucent paints over the white LED to get the color you want. 1 1 Link to post Share on other sites More sharing options...
RMweb Gold Alister_G Posted January 16, 2020 RMweb Gold Share Posted January 16, 2020 4 hours ago, AlfaZagato said: you may be able to play around with translucent paints over the white LED to get the color you want. Yep, I've painted LEDs with normal Humbrol Acrylics before, Matt Sand gives an orangey yellow, or Matt Tan for a whiter but still diffused colour. You can even paint the majority of the LED in Matt Black and just leave the lens showing, to reduce the light output. Al. 1 2 2 Link to post Share on other sites More sharing options...
Andrew P Posted January 16, 2020 Share Posted January 16, 2020 1 minute ago, Alister_G said: Yep, I've painted LEDs with normal Humbrol Acrylics before, Matt Sand gives an orangey yellow, or Matt Tan for a whiter but still diffused colour. You can even paint the majority of the LED in Matt Black and just leave the lens showing, to reduce the light output. Al. I did the same after watching your results on Bakewell Al. 1 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 16, 2020 Author RMweb Gold Share Posted January 16, 2020 The false ceilings are in..... .....and the partitions I’m thinking of lighting the bottom left of the station masters house, the booking office and the waiting I'm not going to light the upper floor or lower left of the station masters house I’m also thinking of not lighting the station masters office, He is either in his house or elsewhere on the platform maybe? I’ve drilled a hole though to the gents to light up the loo too Thoughts anyone (but be gentle ) 7 2 Link to post Share on other sites More sharing options...
RMweb Gold Alister_G Posted January 16, 2020 RMweb Gold Share Posted January 16, 2020 I'm very impressed at how neat everything is, the insides of my buildings are hidden for a reason! I agree with your choices, you'll really only want a very dim light in the gents though. Al. 1 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 16, 2020 Author RMweb Gold Share Posted January 16, 2020 (edited) 48 minutes ago, Alister_G said: I'm very impressed at how neat everything is, the insides of my buildings are hidden for a reason! I agree with your choices, you'll really only want a very dim light in the gents though. Al. It’s not intentionally neat but thank you I won’t be quite as neat once I’ve run black gasket sealant around the edges of the ceilings and partitions to reduce any light bleed I’d hoped I’d chosen the correct ‘rooms’ to light. I just hope it doesn’t look pants with some lit and others not I’ve ordered some resisters of various sizes to experiment with the brightness I wondered if the light from the waiting room alone would be enough to sneak it’s way through the hole I’ve drilled? again I’ll experiment Edited January 16, 2020 by chuffinghell 2 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 16 hours ago, Alister_G said: ............You can even paint the majority of the LED in Matt Black and just leave the lens showing, to reduce the light output. Al. I'm going to glue short lengths of tube through holes in the 'ceiling' to hold the LEDs with just the lens showing which I assume would have a similar effect? 1 1 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 (edited) Now I did say that I’d make a mess on the inside with silicone So not wanting to disappoint It works a treat in sealing any gaps and stoping light bleeding through Placed over my 18v torch and no light bleed on the ‘room’ that’s been sealed....happy days Edited January 17, 2020 by chuffinghell 3 1 Link to post Share on other sites More sharing options...
RMweb Gold Alister_G Posted January 17, 2020 RMweb Gold Share Posted January 17, 2020 Nice to see your drug paraphernalia in the first photo... That's very effective. Do you get any bleed through on the external walls? Al. Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 (edited) 31 minutes ago, Alister_G said: Nice to see your drug paraphernalia in the first photo... I purchased a shed load of ebay to mix up paint by ml instead of drops 31 minutes ago, Alister_G said: That's very effective. Do you get any bleed through on the external walls? Yes and No Yes if the LED is on full brightness light bleeds through the mortar lines where the plastic is thinner but I found with the pump house that a thick coat of black enamel on the inside helps to alleviate the problem No if the LED is dimmed This is with one resistor This is with three resistors in series Edited January 17, 2020 by chuffinghell Spelling correction 5 1 Link to post Share on other sites More sharing options...
RMweb Gold Alister_G Posted January 17, 2020 RMweb Gold Share Posted January 17, 2020 The three-resistors looks about right for electric light, maybe could go a little bit dimmer for gas? Al. 2 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 (edited) 3 minutes ago, Alister_G said: The three-resistors looks about right for electric light, maybe could go a little bit dimmer for gas? Al. Agreed, I’ve order some more of higher resistance The loo is definitely too bright I don’t really understand LEDs and electrickery so I prefer grain of wheat bulbs via a potentiometer but they can get hot and impossible to replace if/when they blow Edited January 17, 2020 by chuffinghell 2 3 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 9 minutes ago, Alister_G said: The three-resistors looks about right for electric light, maybe could go a little bit dimmer for gas? Al. In all fairness the look quite a bit brighter on camera than in reality If I cant figure out the correct LEDs/resistor combination I might end up going back to what I know best (AKA normal bulbs( and hope for the best 1 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 1 hour ago, Alister_G said: The three-resistors looks about right for electric light, maybe could go a little bit dimmer for gas? Al. I’ve just checked and I’ve ordered 2k,3k and 4k resistors the ones I have are 1k and when used in series 3x1k is equivalent to 1x3k So I suspect I will be using the 4k at least Had I experimented prior to ordering I wouldn’t have bothered with the 2 & 3k but I could still use combinations 1 Link to post Share on other sites More sharing options...
RMweb Gold Alister_G Posted January 17, 2020 RMweb Gold Share Posted January 17, 2020 (edited) You can still use a pot on LEDs you know, so long as you have a base resistor in series so you limit the maximum current available. A quick and dirty calculation for using LEDs is supply voltage minus LED forward voltage divided by expected current draw. Typical Red, Green, Orange, and Yellow LEDs have a forward voltage of approximately 2.0 volts; but White and Blue LEDs have a forward voltage value of 3.4 volts. Because of this variation the value of resistor value will vary depending on what the LED color is. A useable average current draw is 10mA. So based on a 12V supply, if we plug those numbers into the calculation we get (12-2) / 0.010 which equals a nice round 1000. So for a single Red, Green, Orange, and Yellow LEDs a 1K resistor will do. If we do the same calculation with White or Blue LEDs we get (12 - 3.4) / 0.010 = 860. You could try to find an 860 Ohm resistor, or you could just not bother, and use a 1K for that, too. EDIT: those figures above are for the LEDs at maximum brightness, obviously, to dim them further you just add more Ohms. If you then shove a 2.2K pot in series, that should give you sufficient dimmage. If you're using multiple LEDs in parallel, then you sum the current required, so for five White LEDs in parallel, the calculation works out at (12 - 3.4) / 0.050 = 172, so a 200 Ohm resistor would be fine, but you would need to up the wattage of the resistor to cope with the higher current. Al. Edited January 17, 2020 by Alister_G 4 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 (edited) 1 hour ago, Alister_G said: You can still use a pot on LEDs you know, so long as you have a base resistor in series so you limit the maximum current available. A quick and dirty calculation for using LEDs is supply voltage minus LED forward voltage divided by expected current draw. Typical Red, Green, Orange, and Yellow LEDs have a forward voltage of approximately 2.0 volts; but White and Blue LEDs have a forward voltage value of 3.4 volts. Because of this variation the value of resistor value will vary depending on what the LED color is. A useable average current draw is 10mA. So based on a 12V supply, if we plug those numbers into the calculation we get (12-2) / 0.010 which equals a nice round 1000. So for a single Red, Green, Orange, and Yellow LEDs a 1K resistor will do. If we do the same calculation with White or Blue LEDs we get (12 - 3.4) / 0.010 = 860. You could try to find an 860 Ohm resistor, or you could just not bother, and use a 1K for that, too. EDIT: those figures above are for the LEDs at maximum brightness, obviously, to dim them further you just add more Ohms. If you then shove a 2.2K pot in series, that should give you sufficient dimmage. If you're using multiple LEDs in parallel, then you sum the current required, so for five White LEDs in parallel, the calculation works out at (12 - 3.4) / 0.050 = 172, so a 200 Ohm resistor would be fine, but you would need to up the wattage of the resistor to cope with the higher current. Al. Thank you very much Al I stupidly didn’t realise that reducing the input voltage made a difference with LEDs I don’t know why I thought that? I just rigged one up to my potentiometer with just one 1k resistor and I can adjust the brightness the same as with a bulb I'll just put a bigger resistor on the LED in the loo and wire all the lights in parallel and adjust the input voltage to suit I genuinely didn’t realise it was that simple and the yellow LEDs aren’t as ‘harsh’ when they are dimmed I can’t take a photo properly because I don’t know how to take photos with my iPhone without the LEDs looking 10x brighter than they actually are 1k @ 7volts 1k @ 4volts 1k @ unknown voltage (gauge doesn’t read below 4volts) Edited January 17, 2020 by chuffinghell 4 Link to post Share on other sites More sharing options...
RMweb Gold Alister_G Posted January 17, 2020 RMweb Gold Share Posted January 17, 2020 That's great, should work a treat. Al. Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 This is a very rough mock up 12 Link to post Share on other sites More sharing options...
RMweb Gold teaky Posted January 17, 2020 RMweb Gold Share Posted January 17, 2020 When you refit the roof, are you going to make it removable this time, e.g. adding triangular sections to fit just inside the walls for an inteference fit or thin strips of double-sided tape on the wall tops? Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 27 minutes ago, teaky said: When you refit the roof, are you going to make it removable this time, e.g. adding triangular sections to fit just inside the walls for an inteference fit or thin strips of double-sided tape on the wall tops? I thought about gluing on magnets but I’ll probably use glue again as LEDs tend to be more reliable than bulbs (or so I’m told) Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 17, 2020 Author RMweb Gold Share Posted January 17, 2020 (edited) I’ve glued in a box section to act as a conduit in the none-lit station masters office and mocked up potential wiring I realise this probably isn’t the right way to do it but it’s neat and means less danger of me melting anything with my soldering iron and less joints to fail that I wouldn’t be able to get to I can just common them all up under the baseboard It also means I could alter the brightness in each individual room if needs be There is usually method in my madness Edited January 17, 2020 by chuffinghell 8 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 18, 2020 Author RMweb Gold Share Posted January 18, 2020 Having slept on it I’ve decided to common up all the lights in the first floor of the station masters house using a chocolate block connector and have just one pair of wires to connect under the baseboard Using a terminal block means I don’t have to worry about soldering in a confined space Only the light in the gents needs to be reduced in brightness so I’ll do that with resistors I’m making it up as I go, hence the change of plans 6 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 18, 2020 Author RMweb Gold Share Posted January 18, 2020 This is the neatest I could do, I still have one more LED to make up I’m going to put a false wall in front of the chocolate block connector just in case it can been seen through the windows in daylight 3 Link to post Share on other sites More sharing options...
RMweb Gold chuffinghell Posted January 18, 2020 Author RMweb Gold Share Posted January 18, 2020 Just like to thank @Alister_G for explaining how to wire the LEDs in a way for my simple brain to understand Cheers Al 1 Link to post Share on other sites More sharing options...
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