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Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum and polarization. Its speed in a vacuum, 299 792 458 metres a second (m/s), is one of the fundamental constants of nature. Like all types of electromagnetic radiation, visible light propagates by massless elementary particles called photons that represents the quanta of electromagnetic field, and can be analyzed as both waves and particles. The study of light, known as optics, is an important research area in modern physics.
The main source of light on Earth is the Sun. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight.

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  1. J

    Superser element won't light up

    I have a 2 bar mini superser. It ignites OK but makes a rumbling noise when lit. Also the second element won't light up when button is depressed
  2. PlasmaMan13

    Baxi Solo 3 Pilot Light Always On

    Hi Guys, Got a problem with a Baxi Solo 3 PFL50 The "pilot on" light is on permanently It was intermittent, but is now permanent When this happened, the boiler would not go through the normal start-up sequence Turn on the control and the 'boiler on' light comes on, but goes no further I...
  3. A

    Water leaking from light fixture.

    Hello, I have a question. Is it safe to use a light fixture that had water comming through it? There was a water leak comming from a light fixture in my living room around a week ago. The amount of water that came out was about 300-400ml. It wasn't much because i turned off the water in shower...
  4. J

    Boiler green light off then back on?

    Hi all, I am not sure whether anyone ever saw this issue.... My Worcester Bosch boiler was installed last year August, since then I found the boiler green light (burner light) will be off after HW is satisfied(supposed to be), but after 2 mins it will be back on again! For 2mins of firing, the...
  5. J

    Worcester GreenStar 15Ri - fails with blue flashing light

    Condensing boiler installed by local Gas Safe plumber in 2014, not combi. Failed a couple of weeks ago with flashing blue light which googling suggests means no gas, blocked flue or blocked condensate pipe. There is gas, the flue is clear, and the condensate pipe goes into the under-sink waste...
  6. P

    Baxi Duo Tec Combi HE error display light is not working/blank

    Hello All My Baxi Duo Tec Combi HE error display light is not 'lit up' - it appears to be blank. My boiler hasn't worked since the weekend so I checked the boiler panel expecting to see an error E119 low pressure message which I can normally fix myself. The error message display panel appears to...
  7. U

    Greenstar 30 CDi every panel light flashing

    Hi, came home to this tonight. Boiler had been running fine, no problems at all. As no heat or hot water went to check boiler and it was lit up like a Christmas tree! No buttons functioning. Switched it off and on. Any idea? No fault codes given just every light flashing. Cheers.
  8. G

    Worcester combi 25Si burner light out

    Hi all. was wondering if anyone knew why my hot water is not working on Worcester Greenstar 25Si . sequence of events: I removed a radiator for decorating , shutting of valves etc then repressurised the boiler back up to 1.5. All seemed to be working . I turned off water overnight. Next day I...
  9. A

    Baxi heat only boiler - switches off after a few minutes with a red flashing light

    Baxi heat only boiler (7 yrs old) - switches off after a few minutes with some banging noises followed by a red flashing light on boiler Reset the boiler manually after 5 mins and it runs fine all day Next day when i switch on the boiler on it does the same thing ive opened the screw on the pump...
  10. M

    Blue light constant on Worcester boiler but no heat

    Blue light on but no heat from radiators. When I reset the boiler, there is a slight chugging noise like it’s wanting to fire up but can’t. The blue light is on constantly
  11. P

    BAXI 105E Error 60 light

    Hi, have changed the DHW diaphragm as wasn’t getting hot water to shower, the old one did have a tear. Now getting error 60 light every 5 or 6 times the boiler fires up. Could this have anything to do with the change I made? many help much appreciated 😀
  12. A

    Worcester boiler blue light on

    Good morning everyone, I woke up to find the radiators unusually hot. Went to check the Worcester 30Si and the blue light was on even though no demand (fire symbol) was showing. The room temperature was well above the room thermostat (Honeywell, wired) setting. Hot water is fine. Tried...
  13. L

    Absolutely no pilot light on Gas heater, Help!

    Hi all, Over the years I had to replace the entire burner assembly on my gas water heater. The common issue was the pilot light would keep going out, so I would replace the entire burner unit. (all wires & the burner) All was good over the past 4 years until today. My pilot light is no where to...
  14. M

    Glowworm Hideaway 100FF Non volatile lockout / reset light on

    Hi, I inherited the above boiler when we moved house about 3 years ago and it has never given me any trouble until now. In the last few weeks we have noticed that the heating is not coming on every now and again and when I look at the boiler the reset light is on. We realised that our 18...
  15. townfanjon

    UniLite Mini small bright work light

    Guys , I have always struggled finding a bright small work light , tried every inspection lamp made , they constantly fall over , drive me nuts and I have found this belter . Pipe slice to give you an example of size , not cheap £36 but fits in the toolbox and does the job . Google UniLite mini .
  16. S

    Boiler pilot light won't stay lit after meter change

    We just had our meters changed from prepayment to smart meters. The boiler was lit after with no leaks, but has subsequently gone out and won't stay lit anymore. There is still a good gas supply to the cooker so I don't think it's a supply issue. Any ideas???
  17. A

    Pilot light in boiler keeps going out, but only when boiler is warm

    Hi all, Just looking for some advice really. I have a Glowworm Ultimate boiler which looks like this: I have a very strange problem with it in that if the boiler is cold and I switch it on, the pilot light comes on, stays on and the boiler kicks in fine. However, after around 20 minutes, the...
  18. M

    Worcester Greenstar Junior 28i combi boiler - no green light or heating

    Hi all, First of all, I hope I have posted this in the correct place (apologies if not). I haven't used my boiler throughout the summer and have gone to turn the heating on. The hot water is fine and no problems but the green light does not come on my boiler and there is no heat. The blue...
  19. Dan

    Posting in a private forum will show a light blue text area

    If you're posting in a private forum the text area where you type will now have a light blue background so that you know said forum is private. I know it's not easy to tell whether the forum you're browsing is in public or private view on this new software. So it has caught out a few guys (and...
  20. D

    triton t80z had for 2.5 years now no hot water, low pressure light comes on when turn on

    Hi, just a homeowner who can decorate but that's about it. Have read a few forums about the triton t80z 9.5kw cold feed only and have ordered a new one as 5 of us use the shower every day so recon the heating filament might be knackered. I live in a hard water area. cold water in bathroom taps...
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