Going to be tough.
The request is for a yellow bulb, that is light in color, yet bright enough to turn a white insert a light yellow.
An Optix Bulb, gives off a very nice yellow hue, and is designed for inserts, and Id try that or a 4 SMD, even a 1 Watt.
If either of those are too dark in color, or night bright enough, a gel is the next step.
Every yellow bulb that is a doped diode, will have different hue, but a COB (1 Watt Magnum) and a Piranha Superflux (an Optix)
are different fabrications.
Much like the work done on Purple....A Dark color bright, this request is for a light hue in the spectrum, to be light in color, and
bright in intensity. Its tricky, and doesnt always work, but I have been happy with an Optix yellow when in the same situation.
I cant say how you personally will find the hue of yellow from this bulb, but have not found any other way.
(It doesnt mean their arent any lighter yellow, or a different solution, just that doped diodes with either be light yellow, and then not bright enough)
Quoted from dothedoo:How do the flame bulbs work? Do they cycle through the 4 LEDs? Do they pulsate In intensity?
There is a video, and these cycle through red, Amber, and warm white, while keeping one red always lit.
2 Bulbs in the same use, create the best illusion, so they arent "in sync"
If you are looking for a fire creation that varies in intensity, I dont believe they can fit that all in one bulb base, so this would likely be a board based solution.
Some hand made ones have been made in the past that will give a programmed degree of intensity change and randomness, and because of production costs in small numbers, Id expect a $10-$25 product could be made to achieve your needs.
This bulb does a nice job in a backbox art situation, or in a MOD, but likely isnt the "Perfect" Solution for everyones needs, imagination, or interpretation of fire and explosion. Worth trying, very affordable, but when I was testing many friends were pleased,
others wanted the bulb to have a programmed display.