This is a UK thing.

Data, have you tried TLC/SETS? Newtown Road near the Goldstone Retail Park. They have a catalogue too. Lamps&Tubes

Thanks for that Snowy, they seem a bit more expensive than Wickes

https://www.tlc-direct.co.uk/Products/LTGB3BCOP.html

£5.50 instead of £3.99

I've found them in stock at Wicks Burgess Hill, going to jump in the car and grab 4, it's such a nice day too, the drive will do me good 

Here is an interesting video, it shows the light spectrum of light bulbs, no surprise really but the LED is the most efficient.

The old incandescent bulb makes a lot of infrared / heat.

Oddly the florescent bulb produces large spikes of colour.

! No longer available

The cheap LEDs flicker but the good ones don't, hmmm! I have both. The cheap ones seem to come in warm and cool versions. The good ones seem to be cool only.

Good to see they all don't give off too much blue. This is what keeps you awake at night and is the problem with screens. I do believe the iPhone (a new one anyway) cuts the blue light output depending on time.

That flicker on the cheap one must be being caused by the bulbs built in power supply, probably needs a bigger capacitor, however a larger cap probably wouldn't fit in the casing.

Don't notice any flicker on the cheaper ones I have, maybe they have improved them now.

Bear in mind that at 1,000 fps, the camera is almost completely eliminating what is called "persistence of vision", which is sort of like a capacitor for our eyes (in a sense, at least). We don't see the flicker because of the time it takes the cells in our eyes to adjust to changes in light. if we could "see" at that sort of speed, the flicker would be not only noticeable, but probably seizure-inducing.

  Thanks for putting that in Dave, I was trying to figure that out. 
Carl2

As I've got older my eyes have become more sensitive to light, bright light, light entering the side of my eye and flickering lights can all trigger a migraine. Got the situation under control at home with shades covering up all my bulbs and the monitor/TV on low brightness.

Going into shops is becoming more of a struggle, many are way too bright for me, I end up having to put sunglasses on. Have to be careful.

  I remember going through a light sensitive phase in my lifetime, now it's about getting enough light to be able to read fine print.
Carl2

  I ran across a small dead flashlight, rather than just trash it I found the battery pack was good but the negative connection did not make contact.  It was disassembled and you could apply 4.5 volts and the leds worked.  I believe the light coming from the leds is about the same range as what comes out of the Philips Daylight Led bulbs used with 120 v.   Since I have 2 lithium battery packs from a camera that died it would be nice to put them together with the leds. 
Carl2

From another thread...

I have found some really cool LED fittings but wouldn't consider buying them 'cos they're all non standard. This picture doesn't do this light justice. It looks great up close.
You can get direct replacement LED tubes if you're going to the extent of changing the running gear anyway. The tubes are directional and may not suit every installation.
I have also found light panels but these are more for commercial applications. They fit the square dimensions of a suspended ceiling (600mm x 600mm over here).

I have also seen some cool TV hacks. If you have or find a dead LED backlit TV, you can remove most of the electronics and use it as a light panel.

Snowy, do these LED tubes fit in to the florescent fitting without any alteration, i.e. do you leave the choke, capacitor and starter in there ?

I've seen these LED tubes but did wonder about that.

I believe they do and they come with a dummy starter as they don't need one but the fitting does.

I've not fitted any yet so can't offer any more advice than that.

Sounds like they might be worth a try then, I'm thinking of my Dads place, he has 2 florescent tubes, I've already replaced the rest of his bulbs but now I should be able to get an LED tube too. Good to know 

  I had looked at these Led lighting tubes, it uses a T 8 style which is the thinner tube, the average price seems to be around $19, I had noticed on the packaging that some required wiring and some could just be put in.  My fixture takes 4 tubes so that would be about $80,  I ended up buying a 8 pack of the T 8 for $29 which is about $4 per tube.  I think it will be like the bulb type leds, the price will decrease over time
Carl2