New bubbling pondweed video and Why does pondweed bubble?

Peter Sigsworth · Dec 19, 2019

SAPS have just released a new video for those of you who use pondweed for measuring photosynthesis by counting bubbles.

Loads of advice:
1.different species of pondweed
2.types of illumination
3.why pondweed bubbles
to name but a few pieces of advice - excellent video

Lesley Newcombe · Dec 20, 2019

Very useful, thanks for sharing!

Peter Sigsworth · Dec 20, 2019

For those who are worried about the lamps to use as I know many have posted threads about this - the video recommends lamps of at least 1,200 lumens (yes they specifically use lumens as a measurement for this) - for all photosynthesis experiments which will include the dreaded ALGAL BALLS

I bought these https://cpc.farnell.com/pro-elec/pel00548/floodlight-led-slim-30w-6000k/dp/LP10253
@ £8 each they are a bargain (2400 lumens) but if you can afford it buy the more powerful ones.

Paul · Dec 20, 2019

Peter Sigsworth said:
For those who are worried about the lamps to use as I know many have posted threads about this - the video recommends lamps of at least 1,200 lumens (yes they specifically use lumens as a measurement for this) - for all photosynthesis experiments which will include the dreaded ALGAL BALLSView attachment 3770

I bought these https://cpc.farnell.com/pro-elec/pel00548/floodlight-led-slim-30w-6000k/dp/LP10253
@ £8 each they are a bargain (2400 lumens) but if you can afford it buy the more powerful ones.

Did you change the lead to maker it longer?

30cm (approx) 3-core mains cable attached

Peter Sigsworth · Dec 20, 2019

No just added 3 pin plugs as our power points are numerous and near enough to be plugged in direct.

Snailo · Jan 9, 2020

Off the back of the brilliant SAPS video that Peter shared before Christmas and with the pondweed bubbling practical looming, I'm after some advice.

I'm trying to source 1,200 lumen lamps (bulbs) to go in our desk lamps we have which are annoyingly SES (E14) fittings. So far I have had no luck sourcing 1,200 lumens to fit. Has anyone been able to source these or am I really going to have to sideline the desklamps I already have and buy new lamps to get the 1,200 lumens required. Slightly tearing my hair out at what I thought was going to be a quick fix!

ClaireS · Jan 9, 2020

Would 12 watt led corn bulbs work in a desklamp fitting? Like these I have found on ebay? Asking as I was hoping to replace bulbs in existing desk lamps for brighter ones as we only have 40 watt equivalent in ours and the practical is rubbish.....I worry that the light is pointing the wrong way if you know what I mean...
Hzsane LED Corn Bulbs, E14 Small Edison Screw, 12W, 1200Lm, 6000K Daylight White, Pack of 4 [Energy Class A+]

Price: £12.99

Peter Sigsworth · Jan 9, 2020

Ebay
https://www.ebay.co.uk/itm/E27-E14-GU10-G9-5W-7W-10W-15W-LED-Corn-Light-Bulb-5730-SMD-Spotlight-Lamp-220V/173951557660?_trkparms=ispr=1&hash=item288052201c:m:mTmfUHdlfny83RRrhMmbx1A&enc=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&checksum=1739515576606f6bc96306e44902a69db9b294f050b0
15w warm white E14 £3.99 each 15000 lm

Paul · Jan 9, 2020

I'd go for a spotlight type depending on the holder.

Lisa J · Jan 23, 2020

Snailo said:
Off the back of the brilliant SAPS video that Peter shared before Christmas and with the pondweed bubbling practical looming, I'm after some advice.

I'm trying to source 1,200 lumen lamps (bulbs) to go in our desk lamps we have which are annoyingly SES (E14) fittings. So far I have had no luck sourcing 1,200 lumens to fit. Has anyone been able to source these or am I really going to have to sideline the desklamps I already have and buy new lamps to get the 1,200 lumens required. Slightly tearing my hair out at what I thought was going to be a quick fix!

Just ordered these for our desk lamps - never used this company before but were the cheapest I could find - 88p each! Not energy efficient but then they never last long anyway the way the kids bash the lamps about!!
https://www.thelightbulb.co.uk/70watt-es-e27-screw-cap-clear-equivalent-to-92watt-2/

Peter Sigsworth · Jan 23, 2020

Lisa J said:
Just ordered these for our desk lamps - never used this company before but were the cheapest I could find - 88p each! Not energy efficient but then they never last long anyway the way the kids bash the lamps about!!
https://www.thelightbulb.co.uk/70watt-es-e27-screw-cap-clear-equivalent-to-92watt-2/

Halogen lights can give off a bit of heat - not sure what these are like but be ready to have put a heat sink barrier between the lamp and your specimens (usually a 500ml beaker of water). LEDs do not give any significant heat off and therefore are preferred.

Lisa J · Jan 23, 2020

yes had considered this - for the older groups will put a heat sink in place. But for younger ones who are just looking the pond weed bubbling purely in response to light we find a little heat helps the plants along!