Recent content by renault

I don't think this thread is the right one to enter a discussion about your comment. I could count myself as both of those although the terms would need very much refining. If you would like to discuss them, please open a thread.

I bought a couple of LED bulbs yesterday, both rated at 4W. One stated to be 470 Lumen / 2,700°K and the other 180 Lumen / 1,800°K. I put one in each of my identical bedside lamps and the difference is enormous. My first reaction was that the 1,800°K. bulb was so yellow and dim (of course)...

yes perhaps a little like some commentators have suggested with so called SMART meters. Their reporting data is modulated along the 240V. a.c. mains cables within the property and it is suggested that this can be harmful. Here at home I do not use wifi but I use a so called powerline ethernet...

thank you all for your contributions on this post. I have learnt a lot. I started with the thought that all LED lighting was bad except for its low energy usage. I am now not so anti LED although imo the illumination it produces is not pleasing to the eye to say the least - even the so called...

Can anyone suggest how the LED bulbs with variable colour temperature work? I can only assume that the only practical variable which could change this would be modification of the supply voltage.

As a lazy person I say "thank you professor"

I have a level of trust in the responses from the contributors on this forum which I don't have of Wikipedia. If you don't find the questions interesting then perhaps you should not 'take the trouble to explain'.

asking questions to learned friendly people on this forum IS part of my research. Nobody is forced to respond.

thanks, a nice summary. It is not so much that 'I am worried' but generally I take the precautionary principal and if some researchers suggest that current LED's used in the home may cause problems, then I want to consider it. Pinball who posted earlier showed a spectrum from an LED bulb which...

thanks, this is useful in that now I know that it is possible to produce a notch filter which can eliminate the 'blue spike' outputted from LED bulbs shown to us earlier in this thread (300-400nm.) So manufacturers could produce bulbs which create this blue light spike at the semiconductor but...

I am interested in your idea of putting bulbs in glass bowls. Just as an example, are you saying that if I put a jam jar over my bulb, the wavelengths of light emanating from the jam jar would change.? I am also curious how the bulbs with variable colour temperature work. the claim variability...

in the interest of not boring others, I will simply say that I wish you well with taking your 'number 1' choices, personally I tend to take your number 2 option, being guided by the 'follow the money' principal and generally what I see around me. I will be happy to continue this line of...

Thanks again for your reply - there is much to unpack there which I thank you for and will digest tomorrow. I must however take exception you your saying "You are free to believe whatever you'd like and to take whatever steps you'd like. But if you come here to PF and ask what steps you can take...

thanks for your reply drakkith. The oft quoted sentiment that 'there is no good evidence' is not one I support. One can find and quote 'evidence' in every field which supports ones own preferred narrative. I prefer to take the cautious approach and for the moment will accept that low frequency...

yes I remember being told that the meat counter in supermarket was illuminated with lower colour temperature bulbs in order to make the meat look more red. It is true - look down the isle of the supermarket